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:
Cats have ____ lives.\Question: Choose the right answer from options given a) five b) one c) two d) nine

Ex Output:
d


Ex Input:
Every person is a carrier for about ____ rare genetic conditions.\Question: Choose the right answer from options given a) nine b) ten c) six d) three

Ex Output:
b


Ex Input:
ABA can affect the cell in ____ different ways depending on the tissue involved.\Question: Choose the right answer from options given a) five b) three c) six d) one

Ex Output:

b