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:
Calves can browse and follow their mother at three weeks old and are weaned at ____ months.\Question: Choose the right answer from options given a) five b) seven c) four d) three

Ex Output:
a


Ex Input:
Vision disorders affect ____ in every four school-age children.\Question: Choose the right answer from options given a) nine b) one c) five d) six

Ex Output:
b


Ex Input:
All primates have ____ fingers on each hand.\Question: Choose the right answer from options given a) eight b) no c) five d) four

Ex Output:

c