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: Decompression illness is a continuum from ____ symptoms or signs to severe multisystem involvement.\Question: Choose the right answer from options given a) nine b) three c) no d) one
Example Output: c

Example Input: Today there are ____ basic classifications of sausage.\Question: Choose the right answer from options given a) five b) four c) six d) one
Example Output: a

Example Input: Hares hold their young ____ to ten days longer.\Question: Choose the right answer from options given a) one b) seven c) two d) four
Example Output:
b