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:
Granite occurs in ____ separate masses.\Question: Choose the right answer from options given a) two b) eight c) nine d) no

Ex Output:
a


Ex Input:
Bees possess ____ eyes.\Question: Choose the right answer from options given a) three b) five c) one d) ten

Ex Output:
b


Ex Input:
Computers operate ____ days often into the wee hours of morning.\Question: Choose the right answer from options given a) seven b) one c) no d) ten

Ex Output:

a