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:
Most endocrinologists see patients every ____ months throughout the pregnancy.\Question: Choose the right answer from options given a) six b) two c) zero d) three

Ex Output:
b


Ex Input:
Redwoods reproduce ____ ways.\Question: Choose the right answer from options given a) zero b) two c) six d) nine

Ex Output:
b


Ex Input:
Black bears have ____ toes, with claws, on the feet.\Question: Choose the right answer from options given a) five b) no c) nine d) eight

Ex Output:

a