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 answer (return the string of the correct option, not 'A' or 'B') for the given question.

Sentence: Engineers have developed some new filaments for use as parts of different structures. Through their research, they notice that a red filament is much thinner than a blue filament. Question: Which of these filaments would be less likely to withstand strain? (A) red filament (B) blue filament
Output:
red filament