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: TriMetal Irons Discover the benefits of ____ different metals.\Question: Choose the right answer from options given a) five b) seven c) no d) three
Example Output: d

Example Input: Children of alcoholics are ____ times more likely than other people to become alcoholics themselves.\Question: Choose the right answer from options given a) zero b) four c) nine d) two
Example Output: b

Example Input: Most ovarian cysts go away on their own in one to ____ months without causing any problems.\Question: Choose the right answer from options given a) zero b) five c) three d) nine
Example Output:
c