Choose the pair in which the relationship between the two words is different from that in the other pairs.

Introduction / Context:
This is a classification question involving word pairs. In most options, you will notice a clear antonym (opposite meaning) relationship between the two words. One pair, however, does not show this kind of opposite relationship. Your task is to identify that differently related pair.

Given Data / Assumptions:

• Lizard : Pad.
• Short : Long.
• Poor : Rich.
• Light : Heavy.
• Hot : Cold.
• We assume usual dictionary meanings of these words.

Concept / Approach:
The first step is to decide what type of relationship exists between the two words in each pair. For four of the pairs, the relationship is that of antonyms, where one word expresses the opposite quality of the other. The odd pair will be the one that does not show an opposite meaning, but some other type of vague or unclear connection instead.

Step-by-Step Solution:
Step 1: Consider \"Short : Long\". These are clearly opposite in meaning with respect to length or duration. If something is not short, it can be long, so they form an antonym pair.Step 2: Look at \"Poor : Rich\". These words are opposites in terms of wealth. Poor describes a lack of money or resources, while rich describes abundance of them.Step 3: Examine \"Light : Heavy\". These are opposite in relation to weight. An object that is light is easy to lift, while a heavy object is difficult to lift.Step 4: Check \"Hot : Cold\". These are opposites on the temperature scale. Hot implies high temperature, while cold implies low temperature.Step 5: Now examine \"Lizard : Pad\". Lizard is an animal, and pad could refer to a cushion, a writing pad or the pads on an animal foot, but the pair does not express a clear opposite or standard binary relationship.Step 6: Unlike the other four pairs, which present clear and direct opposites, Lizard and Pad cannot naturally be described as antonyms. They stand in no obvious opposite relation.Step 7: Therefore, \"Lizard : Pad\" is the only pair that does not follow the antonym pattern.

Verification / Alternative check:
To verify, try to insert the phrase \"is the opposite of\" between the two words in each pair. \"Short is the opposite of long\", \"Poor is the opposite of rich\", \"Light is the opposite of heavy\" and \"Hot is the opposite of cold\" all form perfectly correct sentences. But \"Lizard is the opposite of pad\" is meaningless and grammatically strange, confirming that this pair is not an antonym pair.

Why Other Options Are Wrong:
Short : Long, Poor : Rich, Light : Heavy and Hot : Cold are all standard pairs of opposite adjectives used in everyday language. They fit the same category of relationship. Because of that, they form the consistent group in this classification question and cannot be the odd one out.

Common Pitfalls:
Some learners may overthink the word pad and imagine special meanings, such as the adhesive pads on a lizard feet, but this is not a standard lexical relation used in reasoning tests. The exam expects recognition of clear antonym pairs, not obscure associations. If one pair obviously does not fit the pattern of opposites, that is almost always your answer.

Final Answer:
The pair in which the words are differently related is Lizard : Pad.