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').

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

Example Input: Corn borers complete at least ____ generations each summer.\Question: Choose the right answer from options given a) zero b) three c) two d) ten
Example Output: c

Example Input: RAP is defined as episodic attacks of abdominal pain over a period of at least ____ months.\Question: Choose the right answer from options given a) six b) five c) seven d) three
Example Output:
d