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:
Diarrheal disease kills ____ million children every year.\Question: Choose the right answer from options given a) three b) no c) four d) ten

Ex Output:
a


Ex Input:
Children are more likely than adults to show ____ symptoms even if they are infected.\Question: Choose the right answer from options given a) eight b) two c) no d) six

Ex Output:
c


Ex Input:
Sight is foremost among our ____ senses.\Question: Choose the right answer from options given a) five b) four c) eight d) zero

Ex Output:

a