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').

Example Input: Unequal cleavage can occur in ____ ways.\Question: Choose the right answer from options given a) two b) seven c) three d) ten
Example Output: a

Example 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
Example Output: b

Example Input: Stillbirths can occur after heavy drinking in the last ____ months of pregnancy.\Question: Choose the right answer from options given a) six b) three c) four d) nine
Example Output:
b