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:
Scorpions also have ____ legs.\Question: Choose the right answer from options given a) eight b) zero c) nine d) ten

Ex Output:
a


Ex Input:
Matter exists in ____ forms, solid, fluid and plasma.\Question: Choose the right answer from options given a) ten b) nine c) three d) five

Ex Output:
c


Ex Input:
Most people require ____ or eight hours of sleep a day to function well.\Question: Choose the right answer from options given a) one b) ten c) five d) seven

Ex Output:

d