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:
Humans learn through the ____ senses.\Question: Choose the right answer from options given a) eight b) one c) five d) ten

Ex Output:
c


Ex Input:
Sockeye generally spend ____ years at sea.\Question: Choose the right answer from options given a) four b) zero c) ten d) two

Ex Output:

d