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: Vaccination typically occurs at ____ to eight weeks of age in kittens.\Question: Choose the right answer from options given a) three b) nine c) six d) no

Output: c


Input: Consider Input: Decapod crustaceans have ____ pairs of limbs.\Question: Choose the right answer from options given a) five b) four c) six d) seven

Output: a


Input: Consider Input: Activated carbon is used every ____ weeks for a period of a few days and is then removed.\Question: Choose the right answer from options given a) three b) seven c) four d) two


Output: a