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: Ascidian tunicates come in ____ main forms.\Question: Choose the right answer from options given a) three b) zero c) four d) eight

Output: a


Input: Consider Input: Collars come in ____ shapes.\Question: Choose the right answer from options given a) six b) two c) four d) zero

Output: b


Input: Consider Input: Cholesterol is a waxy substance found in ____ places.\Question: Choose the right answer from options given a) six b) zero c) two d) three


Output: c