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:
Genetic mapping divides the chromosomes in ____ bands.\Question: Choose the right answer from options given a) ten b) two c) four d) nine

Ex Output:
b


Ex Input:
Ants have ____ stomachs.\Question: Choose the right answer from options given a) two b) nine c) four d) seven

Ex Output:
a


Ex Input:
Biologists believe that at least three, and perhaps all ____ of the young successfully fledged.\Question: Choose the right answer from options given a) no b) two c) three d) four

Ex Output:

d