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:
Photosynthesis occurs in ____ phases.\Question: Choose the right answer from options given a) four b) two c) nine d) five

Ex Output:
b


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:
Centipedes can measure from ____ to six inches in length.\Question: Choose the right answer from options given a) three b) eight c) five d) one

Ex Output:

d