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

Output: b


Input: Consider Input: Relative fitness is ____ for a sterile organism, even if it is robust and long-lived.\Question: Choose the right answer from options given a) five b) ten c) zero d) three


Output: c