Given the task definition, example input & output, solve the new input case.
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: 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
Output: A
Typically, people with thin frail legs squat less weight than people with big strong legs, so the answer is A.

New input case for you: Sentence: A jackfruit experiences low friction on a red surface and high friction on a purple surface. Question: Which surface is smoother? (A) red surface (B) purple surface
Output:
A