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: Millipedes have ____ pairs of legs on each body segment.\Question: Choose the right answer from options given a) seven b) ten c) six d) two
Example Output: d

Example Input: Hummingbirds feed every ____ to fifteen minutes from sun-up to sundown.\Question: Choose the right answer from options given a) nine b) seven c) four d) ten
Example Output: d

Example Input: Hmong folktales tell of a land of ice and snow with six months of light and ____ of darkness.\Question: Choose the right answer from options given a) six b) two c) no d) ten
Example Output:
a