You are given a sentence, a question and two answer options ('A' and 'B'). Your task is to find the correct option for the given question. Write down the answer index: 'A' or 'B'.

Example Input: Sentence: An envelope that is slid across a dresser gets rather hot, while one that is slid across a desk doesn't get very hot at all. Question: Which surface has more friction? (A) desk (B) dresser
Example Output: B

Example Input: Sentence: A penguin is forced to swim at a low rate of speed through icy water, but can swim rather quickly through clear water. Question: Which water is the most rough? (A) icy water (B) clear water
Example Output: A

Example Input: Sentence: Paul has taken a job in a warehouse. Paul stacks boxes onto a pallet. Later, Paul sits down in the break room. Question: In which situation will Paul's shirt be more wet from perspiration? (A) When he's stacking boxes (B) When he's sitting down
Example Output:
A