Teacher: You are given a sentence, a question and two answer options ('A' and 'B'). Your task is to find the correct answer (return the string of the correct option, not 'A' or 'B') for the given question.
Teacher: Now, understand the problem? If you are still confused, see the following example:
Sentence: Jacob and Benny are squatting at the gym. Jacob has thin frail legs and Benny has big strong legs. Question: Who squats less weight? (A) Jacob (B) Benny
Solution: Jacob
Reason: Typically, people with thin frail legs squat less weight than people with big strong legs, so the answer is Jacob.

Now, solve this instance: Sentence: A tree trunk is thicker then a tree leaf. Question: Which part of the tree is the stronger one? (A) leaf (B) trunk
Student:
trunk