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: Batteries consist of ____ electrodes immersed in an electrolyte.\Question: Choose the right answer from options given a) two b) eight c) three d) seven

Output: a


Input: Consider Input: Sexual maturity is reached at about ____ years of age.\Question: Choose the right answer from options given a) five b) ten c) no d) two

Output: d


Input: Consider Input: Cancer is among the ____ leading causes of death in all age groups, except very young children.\Question: Choose the right answer from options given a) three b) zero c) eight d) no


Output: a