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: Ruminants have an even number of toes on each foot and a stomach with either three or ____ chambers.\Question: Choose the right answer from options given a) four b) two c) seven d) five

Output: a


Input: Consider Input: Salt is more viscous than ice by about ____ orders of magnitude.\Question: Choose the right answer from options given a) six b) nine c) four d) three


Output: d