From the letters N, W, R, O and D, if a meaningful English word can be formed using all five letters exactly once, the fourth letter of that word is your answer. If more than one such word can be formed, the answer should be Y, and if no such word can be formed, the answer should be Z. What is the correct response?

Introduction / Context:
This is a typical meaningful word formation question that combines letter arrangement with vocabulary knowledge. You are given a fixed set of letters and asked whether you can form a valid English word using all of them exactly once. If you can, you must then extract a specific letter from that word. Such problems test quick pattern recognition of common word shapes and ensure that you read the conditional instructions carefully about when to choose Y or Z instead of a normal letter option.

Given Data / Assumptions:
1) The available letters are N, W, R, O and D.2) You must use all five letters exactly once to form a word.3) If exactly one meaningful word exists, the answer is the fourth letter of that word.4) If more than one such word exists, the answer must be Y.5) If no such word exists, the answer must be Z.

Concept / Approach:
The strategy is to mentally test common arrangements involving these letters. Often, exam setters choose familiar words where consonant and vowel positions follow usual English patterns, such as consonant vowel consonant combinations. Look for recognisable root words or endings, like OWN, ROW, WORD and so on. Once you suspect a valid word, confirm that it uses each given letter exactly once and that it is commonly accepted in standard English. Then simply read off the fourth letter and match it to the options.

Step-by-Step Solution:
1) List the letters: N, W, R, O, D. There is one vowel O and four consonants.2) Try to form a familiar pattern. A natural arrangement is D R O W N, which spells DROWN, a common English verb.3) Check that DROWN uses each letter exactly once: D, R, O, W and N all appear and none is repeated or omitted.4) Confirm that DROWN is a standard word meaning to die in water or to cover completely with a liquid.5) Examine whether any other common five letter English word can be made from N, W, R, O and D. No standard alternative comes up in typical exam level vocabulary.6) Since exactly one meaningful word is found, you must pick the fourth letter of DROWN as the answer.7) Number the letters: D (1), R (2), O (3), W (4), N (5). The fourth letter is W.

Verification / Alternative check:
A further check is to test other simple permutations like WORDN, WRODN or NWORD and see whether they form recognised words. DROWN is widely known, while these alternatives are not accepted standard English words. Exam questions of this type rely on common dictionary words rather than obscure or proper nouns. Because only one valid candidate arises in normal vocabulary use, the condition for using the literal fourth letter instead of Y or Z is satisfied. When you confirm that W is indeed the fourth letter, the answer becomes clear.

Why Other Options Are Wrong:
D is one of the letters but it is the first letter of DROWN, not the fourth.Y would indicate that more than one meaningful word can be formed, which is not reasonable for this set in standard usage.Z would indicate that no meaningful word exists, which is incorrect because DROWN clearly exists.None of these is wrong because W exactly matches the required fourth letter.

Common Pitfalls:
Some candidates misread the instructions and select D for DROWN, assuming they should mark the word itself rather than the specific letter position. Others jump to Y or Z without thoroughly attempting letter combinations, especially when the letters are not in obvious dictionary order. A careful rereading of the rules and a little patience with rearranging letters usually reveals the intended word. Practising similar problems helps build an intuition for common roots and endings that exam setters like to use.

Final Answer:
The only meaningful word formed is DROWN, and its fourth letter is W.