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:
Most spiders have ____ eyes and eight legs.\Question: Choose the right answer from options given a) eight b) five c) no d) three

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:
Walruses walk with ____ flippers over ice and snow.\Question: Choose the right answer from options given a) nine b) three c) seven d) four

Ex Output:

d