You will be given a definition of a task first, then some input of the task.
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'.

Sentence: Mike knows that a train is slower then a plane. Question: If he rides both vehicles for 40 minutes, which will have taken him a lesser distance? (A) train (B) plane
Output:
A