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 people have ____ symptoms until the liver has been quite severely damaged.\Question: Choose the right answer from options given a) eight b) no c) nine d) ten

Ex Output:
b


Ex Input:
Cats can harbor a heartworm infection at any age from ____ months to seventeen years.\Question: Choose the right answer from options given a) one b) six c) nine d) three

Ex Output:
c


Ex Input:
Fragrant flowers emerge from pods, staying in bloom ____ to eight weeks.\Question: Choose the right answer from options given a) ten b) seven c) six d) nine

Ex Output:

c