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:
Pairs encodes all sets of objects with ____ components.\Question: Choose the right answer from options given a) ten b) five c) two d) no

Ex Output:
c


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:
Many children have a bowel movement only once every three or ____ days.\Question: Choose the right answer from options given a) four b) one c) seven d) three

Ex Output:

a