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: Death occurs during the first ____ days of illness without intensive care.\Question: Choose the right answer from options given a) seven b) eight c) five d) nine

Output: a


Input: Consider Input: Lizards generally have ____ legs and movable eyelids.\Question: Choose the right answer from options given a) four b) two c) five d) zero

Output: a


Input: Consider Input: Scientists believe that life first appeared on Earth nearly ____ billion years ago.\Question: Choose the right answer from options given a) four b) three c) no d) ten


Output: a