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:
Pairs encodes all sets of objects with ____ components.\Question: Choose the right answer from options given a) ten b) five c) two d) no

Ex Output:
c


Ex Input:
All spider mites have ____ legs and a lack of a separate head.\Question: Choose the right answer from options given a) eight b) four c) ten d) one

Ex Output:
a


Ex Input:
Bicycles are a healthy alternative to vehicles, and produce ____ emissions in their use.\Question: Choose the right answer from options given a) two b) seven c) no d) six

Ex Output:

c