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: Chlorine gives vinyl ____ advantages.\Question: Choose the right answer from options given a) six b) four c) two d) ten
Example Output: c

Example Input: Giraffes are ruminants and have a stomach with ____ compartments that digests the leaves they eat.\Question: Choose the right answer from options given a) two b) ten c) three d) four
Example Output:
d