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:
Islamic practice is based on what are called the ____ pillars of faith.\Question: Choose the right answer from options given a) eight b) one c) five d) four

Ex Output:
c


Ex Input:
Most infected persons have ____ symptoms of disease.\Question: Choose the right answer from options given a) six b) no c) three d) one

Ex Output:
b


Ex Input:
Hoppers begin egg laying ____ to three weeks after reaching the adult stage.\Question: Choose the right answer from options given a) nine b) two c) three d) one

Ex Output:

d