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: Vaccinated newborns have protection for at least ____ years.\Question: Choose the right answer from options given a) four b) five c) two d) no

Output: b


Input: Consider Input: Ants have ____ distinct body parts.\Question: Choose the right answer from options given a) nine b) zero c) no d) three

Output: d


Input: Consider Input: Arteries consist of ____ distinct layers.\Question: Choose the right answer from options given a) seven b) ten c) no d) three


Output: d