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: Routers are basically systems, which connect ____ networks together.\Question: Choose the right answer from options given a) three b) two c) nine d) six

Output: b


Input: Consider Input: Natural tellurium consists of ____ isotopes.\Question: Choose the right answer from options given a) six b) seven c) eight d) one

Output: c


Input: Consider Input: Diabetes come in ____ types.\Question: Choose the right answer from options given a) five b) one c) two d) eight


Output: c