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: Echinoderms usually have ____ appendages, but there are some exceptions.\Question: Choose the right answer from options given a) ten b) five c) seven d) three

Output: b


Input: Consider Input: Infants can tell their mothers from other mothers in ____ days.\Question: Choose the right answer from options given a) no b) zero c) five d) three

Output: d


Input: Consider Input: Toxicity can occur in ____ different modalities, acute, sub-acute and chronic toxicity.\Question: Choose the right answer from options given a) six b) three c) ten d) zero


Output: b