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:
Most people recover in one to ____ months.\Question: Choose the right answer from options given a) no b) three c) seven d) eight

Ex Output:
b


Ex Input:
Most viruses have only ____ organelles.\Question: Choose the right answer from options given a) ten b) two c) four d) eight

Ex Output:
b


Ex Input:
Space is a configuration of ____ 'immaterial particles'.\Question: Choose the right answer from options given a) ten b) seven c) four d) five

Ex Output:

c