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:
Mountain goats have ____ sharp horns.\Question: Choose the right answer from options given a) two b) six c) ten d) four

Ex Output:
a


Ex Input:
Many people have ____ symptoms until they suffer chest pains or a heart attack.\Question: Choose the right answer from options given a) three b) one c) no d) seven

Ex Output:
c


Ex Input:
Turkey has ____ geographic regions.\Question: Choose the right answer from options given a) nine b) two c) eight d) seven

Ex Output:

d