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:
Cats have ____ toes on their front paws, but only four touch the ground when walking.\Question: Choose the right answer from options given a) six b) nine c) five d) zero

Ex Output:
c


Ex Input:
Postneonatal deaths refer to deaths after the first ____ weeks but before the end of the first year.\Question: Choose the right answer from options given a) seven b) three c) four d) two

Ex Output:

c