Gender vocabulary: “What is the feminine of bull?” Choose the correct feminine term corresponding to the male animal bull.

Introduction / Context:
This is a basic English vocabulary and general knowledge question focusing on masculine and feminine forms of animal names. The word “bull” refers to the adult male of cattle. The question asks for the corresponding feminine term. Such questions are common in language and general awareness sections and require familiarity with traditional English names for male and female animals.

Given Data / Assumptions:

• Bull is the adult male of the cattle species, often used for breeding. • We must find the feminine counterpart among these options: mule, ostrich, tigress, heifer. • We assume standard usage in English for farm and wild animals.

Concept / Approach:
The female of a bull is generally a cow. However, the term heifer is used specifically for a young female cow that has not yet calved. Among the given options, only heifer is a feminine term related to cattle. Mule is a hybrid animal, ostrich is a bird, and tigress is the female of tiger. Even though cow is the more general opposite of bull, in this list heifer is the only correct cattle related feminine noun and therefore is the expected answer.

Step-by-Step Solution:
Step 1: Identify the species of the male animal. Bull refers to male cattle, especially adult males used for breeding in farms. Step 2: Recall the female terms. The female cattle is commonly called a cow. A heifer is a young female cow, generally one that has not yet had a calf. Step 3: Inspect the options. Mule is a hybrid of a male donkey and a female horse; it is not specially male or female and not related to cattle. Ostrich is a large bird from Africa; again no relation to cattle. Tigress is the female of tiger, a big cat, unrelated to bulls. Heifer is a term for a young female cow, part of the same cattle family as bull. Step 4: Therefore, heifer is the only option that works as the feminine form connected to bull.

Verification / Alternative check:
We can use the terms in context. In farming, one might say, “The bull and the heifer are kept in separate enclosures.” This usage is standard in agricultural contexts. The other options would produce incorrect statements, such as “The bull and the tigress are kept together”, which mixes species. Since exam questions cannot introduce species mismatch for a correct gender pairing, heifer is clearly the intended answer.

Why Other Options Are Wrong:
• Mule: A working animal produced from a horse and donkey cross. It is not a gender counterpart of bull. • Ostrich: A bird species, not related to cattle, so it cannot be the feminine of bull. • Tigress: The female of tiger, again from a completely different species and not the counterpart of bull.

Common Pitfalls:
Some learners expect the word cow to appear and may become confused when it is absent. In such cases, the strategy is to look for any option that is at least from the same species group. Heifer qualifies as a female cattle term. Remember that heifer is specifically a young cow and that exam setters often use such terms to test deeper vocabulary knowledge beyond the most common words.

Final Answer:
The correct feminine term related to bull in this list is Heifer.