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:
Humans learn through the ____ senses.\Question: Choose the right answer from options given a) eight b) one c) five d) ten

Ex Output:
c


Ex Input:
Government buildings fly flags of the ____ nations.\Question: Choose the right answer from options given a) ten b) no c) seven d) two

Ex Output:
d


Ex Input:
Pups continue to suckle until ____ months of age.\Question: Choose the right answer from options given a) four b) three c) no d) two

Ex Output:

a