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: Vampires generally are male, and rabies is ____ times more frequent in men than in women.\Question: Choose the right answer from options given a) no b) two c) zero d) seven
Example Output: d

Example Input: Oranges signify good health, and the number ____ sounds like the word for prosperity.\Question: Choose the right answer from options given a) eight b) ten c) seven d) five
Example Output: a

Example Input: Lampreys reach up to a length of four feet and as small as ____ inches.\Question: Choose the right answer from options given a) ten b) seven c) five d) zero
Example Output:
c