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').

Input: Consider Input: Rheumatic fever begins one to ____ weeks after an untreated streptococcal infection.\Question: Choose the right answer from options given a) six b) ten c) two d) zero

Output: a


Input: Consider Input: Streptomyces are of special interest for ____ reasons.\Question: Choose the right answer from options given a) nine b) seven c) four d) two

Output: d


Input: Consider Input: Colicky babies cry more often than that, sometimes well in excess of ____ hours.\Question: Choose the right answer from options given a) no b) four c) two d) eight


Output: b