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:
Water weighs about ____ pounds per gallon.\Question: Choose the right answer from options given a) seven b) ten c) zero d) nine

Ex Output:
b


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:
Plants have only ____ types of organs.\Question: Choose the right answer from options given a) no b) ten c) five d) eight

Ex Output:

c