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:
Banks hold ____ excess reserves and the public holds no currency.\Question: Choose the right answer from options given a) two b) seven c) ten d) no

Ex Output:
d


Ex Input:
Hydra has ____ distinct methods of reproduction, asexual and sexual.\Question: Choose the right answer from options given a) two b) zero c) no d) ten

Ex Output:
a


Ex Input:
Fever continues to rise and fall, sometimes for as long as ____ weeks.\Question: Choose the right answer from options given a) two b) three c) nine d) seven

Ex Output:

b