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:
Lizards generally have ____ legs and movable eyelids.\Question: Choose the right answer from options given a) four b) two c) five d) zero

Ex Output:
a


Ex Input:
Calves remain hidden for much of the time, and are weaned by ____ months of age.\Question: Choose the right answer from options given a) six b) three c) eight d) one

Ex Output:
b


Ex Input:
Some taxonomists classify only ____ species though.\Question: Choose the right answer from options given a) one b) six c) two d) three

Ex Output:

c