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:
Ground beef can last up to four months, and chicken parts can stay good for ____ months.\Question: Choose the right answer from options given a) ten b) no c) nine d) zero

Ex Output:
c


Ex Input:
Human females have ____ X chromosomes.\Question: Choose the right answer from options given a) two b) six c) one d) eight

Ex Output:
a


Ex Input:
Foals remain with their dams until the fall when they are weaned at ____ to six months of age.\Question: Choose the right answer from options given a) five b) seven c) four d) three

Ex Output:

c