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: Insects have ____ common types of metamorphosis.\Question: Choose the right answer from options given a) six b) eight c) two d) seven

Output: c


Input: Consider Input: National immunization vaccinates all children under ____ against polio.\Question: Choose the right answer from options given a) zero b) four c) ten d) five

Output: b


Input: Consider Input: Tobacco kills ____ million people annually.\Question: Choose the right answer from options given a) ten b) no c) four d) two


Output: c