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:
Fryers have ____ thermostats.\Question: Choose the right answer from options given a) five b) three c) two d) one

Ex Output:
c


Ex Input:
All birds have ____ legs with four toes each.\Question: Choose the right answer from options given a) zero b) one c) three d) two

Ex Output:
d


Ex Input:
Golden jackals live eight to ____ years in the wild and up to sixteen in captivity.\Question: Choose the right answer from options given a) no b) zero c) ten d) nine

Ex Output:

d