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:
Nymphs feed and mature through five instars in about ____ to eight weeks.\Question: Choose the right answer from options given a) six b) five c) seven d) zero

Ex Output:
a


Ex Input:
Lines of force are ____ dimensional, surrounding a bar magnet on all sides.\Question: Choose the right answer from options given a) eight b) three c) zero d) no

Ex Output:
b


Ex Input:
Some people have ____ signs or symptoms at all.\Question: Choose the right answer from options given a) six b) no c) nine d) eight

Ex Output:

b