Given a sentence with a missing word, pick the answer option that best fills out the missing word in the sentence. Indicate each answer with its index ('a', 'b', 'c', 'd').

Example Input: Evolution is dependent on ____ forces.\Question: Choose the right answer from options given a) no b) five c) two d) seven
Example Output: c

Example Input: Sports bras come in ____ basic styles.\Question: Choose the right answer from options given a) five b) six c) two d) zero
Example Output: c

Example Input: Infertility affects one in ____ couples and affects both men and women.\Question: Choose the right answer from options given a) two b) four c) seven d) no
Example Output:
c