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: Trinity comes from tri-unity which means ____ in one.\Question: Choose the right answer from options given a) four b) three c) eight d) zero
Example Output: b

Example Input: Human females have ____ X chromosomes.\Question: Choose the right answer from options given a) two b) six c) one d) eight
Example Output: a

Example Input: Porcupines generally live up to ____ years in the wild.\Question: Choose the right answer from options given a) no b) nine c) ten d) eight
Example Output:
b