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:
Polyester has ____ favorable properties.\Question: Choose the right answer from options given a) four b) two c) seven d) six

Ex Output:
b


Ex Input:
Carbon can bond to a maximum of ____ atoms.\Question: Choose the right answer from options given a) six b) ten c) five d) four

Ex Output:
d


Ex Input:
Alcohol is high in calories - it supplies ____ calories per gram and no nutrients worth mentioning.\Question: Choose the right answer from options given a) seven b) five c) three d) no

Ex Output:

a