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').

Input: Consider Input: Gases are perhaps the best understood of the ____ states of matter.\Question: Choose the right answer from options given a) three b) five c) nine d) zero

Output: a


Input: Consider 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

Output: c


Input: Consider Input: Holograms are apparent images with ____ dimensional structure.\Question: Choose the right answer from options given a) eight b) three c) zero d) two


Output: b