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: Birds have ____ eyes.\Question: Choose the right answer from options given a) eight b) five c) nine d) two

Output: d


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: Reproductive maturity occurs at seven to ____ years .\Question: Choose the right answer from options given a) six b) eight c) five d) ten


Output: d