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: Brachiopods are superficially similar to bivalves, both having ____ shells.\Question: Choose the right answer from options given a) two b) eight c) seven d) one
Example Output: a

Example Input: Most people recover in one to ____ months.\Question: Choose the right answer from options given a) no b) three c) seven d) eight
Example Output: b

Example Input: Crickets are a little smaller as adults but ____ less versatile.\Question: Choose the right answer from options given a) zero b) three c) six d) no
Example Output:
d