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:
Blood pressure is measured by ____ numbers.\Question: Choose the right answer from options given a) zero b) eight c) two d) seven

Ex Output:
c


Ex Input:
Statistics show that within ____ years of divorce, many people marry a second time.\Question: Choose the right answer from options given a) four b) nine c) six d) three

Ex Output:
d


Ex Input:
Ruminants have a fore-stomach with ____ chambers.\Question: Choose the right answer from options given a) four b) three c) two d) seven

Ex Output:

a