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').

Ex Input:
Ossification begins up to ____ months before birth.\Question: Choose the right answer from options given a) nine b) seven c) three d) six

Ex Output:
b


Ex Input:
Coccidiosis usually occurs from ____ weeks of age.\Question: Choose the right answer from options given a) zero b) no c) three d) eight

Ex Output:
c


Ex Input:
Copperheads have a gestation period of ____ to nine months.\Question: Choose the right answer from options given a) zero b) two c) five d) three

Ex Output:

d