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:
Cleavage occurs typically in either one, two, three, four, or ____ directions.\Question: Choose the right answer from options given a) six b) three c) ten d) two

Ex Output:
a

Ex Input:
Most people have ____ kidneys.\Question: Choose the right answer from options given a) two b) five c) seven d) six

Ex Output:
a

Ex Input:
Most couples expect to get pregnant within about ____ months of trying.\Question: Choose the right answer from options given a) six b) two c) five d) ten

Ex Output:
a