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:
Vaccination typically occurs at ____ to eight weeks of age in kittens.\Question: Choose the right answer from options given a) three b) nine c) six d) no

Ex Output:
c


Ex Input:
Organisms have ____ forms of nucleic acid.\Question: Choose the right answer from options given a) four b) three c) two d) one

Ex Output:
c


Ex Input:
Water is reused, in some plants up to ____ times.\Question: Choose the right answer from options given a) ten b) eight c) six d) zero

Ex Output:

c