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:
Avian kidneys have ____ kinds of nephrons.\Question: Choose the right answer from options given a) four b) eight c) no d) two

Ex Output:
d


Ex Input:
Indian reservations are part of five of the nation's ____ poorest counties.\Question: Choose the right answer from options given a) seven b) nine c) ten d) two

Ex Output:
c


Ex Input:
Domestic violence occurs in ____ out of five South Asian families, experts estimate.\Question: Choose the right answer from options given a) ten b) nine c) one d) no

Ex Output:

c