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:
Some male fish return after just ____ years.\Question: Choose the right answer from options given a) no b) two c) one d) six

Ex Output:
b


Ex Input:
Today there are ____ basic classifications of sausage.\Question: Choose the right answer from options given a) five b) four c) six d) one

Ex Output:
a


Ex Input:
Platelets are very delicate, enable cuts to heal and only last for ____ days.\Question: Choose the right answer from options given a) ten b) five c) nine d) one

Ex Output:

b