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: Alleles segregate independently yielding ____ possible allelic combinations in gametes.\Question: Choose the right answer from options given a) ten b) one c) four d) nine
Example Output: c

Example Input: Cats have ____ sets of vocal cords.\Question: Choose the right answer from options given a) zero b) nine c) two d) three
Example Output: c

Example Input: Mosquitoes spend ____ to two days in the pupae stage.\Question: Choose the right answer from options given a) zero b) three c) two d) one
Example Output:
d