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.

Example Input: Sentence: A leaf skidding onto a dirty porch gets a lot hotter then one skidding onto a clean porch. Question: Which surface will allow the leaf to skid at a higher rate of speed? (A) dirty porch (B) clean porch
Example Output: A

Example Input: Sentence: Nell has very thick hair; Lynn's hair is much thinner. Question: Whose hair is stronger? (A) Nell (B) Lynn
Example Output: B

Example Input: Sentence: A car and a bus are both driving 60 mph, but the car drives longer then the bus. Question: Which vehicle travelled the greater distance? (A) car (B) bus
Example Output:
B