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: Dispassion is a ____ edged sword.\Question: Choose the right answer from options given a) six b) two c) zero d) four
Example Output: b

Example Input: Reality is more than what can be perceived with the ____ senses.\Question: Choose the right answer from options given a) five b) four c) ten d) one
Example Output: a

Example Input: Comets come from ____ regions in the outer solar system.\Question: Choose the right answer from options given a) six b) three c) eight d) two
Example Output:
d