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:
Ground beef can last up to four months, and chicken parts can stay good for ____ months.\Question: Choose the right answer from options given a) ten b) no c) nine d) zero

Ex Output:
c


Ex Input:
Vaccinated newborns have protection for at least ____ years.\Question: Choose the right answer from options given a) four b) five c) two d) no

Ex Output:
b


Ex Input:
Malnutrition already is a cause of over a third of deaths of children under ____ in Africa.\Question: Choose the right answer from options given a) five b) zero c) no d) three

Ex Output:

a