You are given a sentence, a question and two answer options. Your task is to write down the index ('A' or 'B') of the **incorrect** option for the given question.

Ex Input:
Sentence: A billiard ball has a greater mass then a basketball. Question: Which ball has a stronger field of gravity? (A) billiard ball (B) basketball

Ex Output:
B

Ex Input:
Sentence: Mark and Mike grew up together. Both men have always known that Mark is the stronger of the two. Question: If both go out onto a field and throw a baseball, which person will be able to toss it the greater distance? (A) Mark (B) Mike

Ex Output:
B

Ex Input:
Sentence: The Flash and The Hulk decide to race each other. The Flash is the fastest being in the galaxy. They agree to sprint for 1 min. Question: Who wins the race? (A) The Hulk (B) The Flash

Ex Output:
A