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: China is reportedly in the top ____ nations in industrial output.\Question: Choose the right answer from options given a) seven b) ten c) three d) five

Output: b


Input: Consider Input: Vision disorders affect one in every ____ school-age children.\Question: Choose the right answer from options given a) five b) four c) nine d) one

Output: b


Input: Consider Input: Chromosomes have ____ chromatids.\Question: Choose the right answer from options given a) nine b) zero c) two d) six


Output: c