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').

Input: Consider Input: Cattails contain ____ times the starch of an equal weight fo potatoes.\Question: Choose the right answer from options given a) six b) ten c) eight d) two

Output: b


Input: Consider Input: Background radiation comes from ____ sources.\Question: Choose the right answer from options given a) zero b) three c) four d) no

Output: b


Input: Consider Input: Horses can only last for ____ days without water.\Question: Choose the right answer from options given a) three b) nine c) five d) one


Output: a