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: Females inherit ____ X chromosomes, one from each parent.\Question: Choose the right answer from options given a) five b) two c) no d) seven
Example Output: b

Example Input: Influenza epidemics are ____ times more likely during solar maxima.\Question: Choose the right answer from options given a) ten b) eight c) no d) four
Example Output: d

Example Input: Mature Plants can grow up to ____ meters tall.\Question: Choose the right answer from options given a) ten b) zero c) two d) three
Example Output:
d