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: Nematodes occur in ____ general forms.\Question: Choose the right answer from options given a) nine b) two c) seven d) ten

Output: b


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: Front feet have ____ digits and their hind feet have five.\Question: Choose the right answer from options given a) nine b) five c) one d) four


Output: d