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:
Brachiopods are superficially similar to bivalves, both having ____ shells.\Question: Choose the right answer from options given a) two b) eight c) seven d) one

Ex Output:
a


Ex Input:
Twin souls are the last ____ souls to individualize.\Question: Choose the right answer from options given a) two b) ten c) zero d) six

Ex Output:
a


Ex Input:
Hyphenated words are words that are formed from ____ words.\Question: Choose the right answer from options given a) no b) zero c) two d) three

Ex Output:

c