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: Fever usually lasts for an average of ____ days in adults.\Question: Choose the right answer from options given a) zero b) three c) nine d) two

Output: b


Input: Consider Input: Decompression illness is a continuum from ____ symptoms or signs to severe multisystem involvement.\Question: Choose the right answer from options given a) nine b) three c) no d) one

Output: c


Input: Consider Input: Clustering takes many forms, and can scale from ____ computers.\Question: Choose the right answer from options given a) one b) zero c) two d) seven


Output: c