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:
Living cells have at least ____ parts.\Question: Choose the right answer from options given a) seven b) three c) zero d) four

Ex Output:
b


Ex Input:
Stroke is the number ____ cause of death in the United States.\Question: Choose the right answer from options given a) ten b) nine c) one d) three

Ex Output:
d


Ex Input:
Most babies are ready for solid food between four and ____ months of age unless premature.\Question: Choose the right answer from options given a) ten b) seven c) nine d) six

Ex Output:

d