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: Ruminants have an even number of toes on each foot and a stomach with either three or ____ chambers.\Question: Choose the right answer from options given a) four b) two c) seven d) five

Output: a


Input: Consider Input: Condors become sexually mature at about five or ____ years of age and mate for life.\Question: Choose the right answer from options given a) nine b) seven c) one d) six

Output: d


Input: Consider Input: Acute sinusitis is any infectious process in the sinus lasting from ____ day to three weeks.\Question: Choose the right answer from options given a) no b) one c) eight d) seven


Output: b