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').

Ex Input:
Some infected people have ____ symptoms at all.\Question: Choose the right answer from options given a) four b) eight c) no d) five

Ex Output:
c

Ex Input:
Tribal peoples teach that there are ____ parts to any ceremony, each equally important.\Question: Choose the right answer from options given a) four b) nine c) ten d) seven

Ex Output:
a

Ex Input:
Fish are sexually mature at age three and ____ year old fish are common.\Question: Choose the right answer from options given a) four b) three c) six d) seven

Ex Output:
c