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: Interdigital glands are present on all ____ feet, and are slightly larger on the front feet.\Question: Choose the right answer from options given a) three b) five c) four d) eight
Example Output: c

Example Input: Molecules are ____ or more atoms stuck together.\Question: Choose the right answer from options given a) two b) zero c) six d) eight
Example Output: a

Example Input: All sugars contain ____ calories per gram.\Question: Choose the right answer from options given a) zero b) four c) nine d) eight
Example Output:
b