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:
Electrolytic capacitors have a useful life of about ____ years.\Question: Choose the right answer from options given a) ten b) eight c) zero d) seven

Ex Output:
a


Ex 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

Ex Output:
c


Ex Input:
Gravity there is ____ times that of Earth.\Question: Choose the right answer from options given a) six b) ten c) nine d) five

Ex Output:

b