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: Sexual reproduction involves ____ individual organisms.\Question: Choose the right answer from options given a) six b) no c) two d) nine
Example Output: c

Example Input: Roundworms are fairly large worms that can grow to be ____ or five inches long.\Question: Choose the right answer from options given a) no b) nine c) four d) zero
Example Output: c

Example Input: Migrant centers serve infants as young as ____ weeks of age.\Question: Choose the right answer from options given a) six b) one c) five d) no
Example Output:
a