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: Mosquitoes spend one to ____ days in the pupae stage.\Question: Choose the right answer from options given a) zero b) two c) five d) three

Output: b


Input: Consider Input: Many aneurysms have ____ symptoms until they burst.\Question: Choose the right answer from options given a) no b) five c) six d) seven

Output: a


Input: Consider Input: Osteoporosis has ____ symptoms and it progresses slowly.\Question: Choose the right answer from options given a) no b) two c) nine d) seven


Output: a