One day, Fizzy was going to enter a top secret building. As he approached the entrance door, he was blocked by the guard. "12 is equals to what?" asked the guard. "5?" answered Fizzy. "Wrong! You cannot enter this building." the guard said. So Fizzy proceeded to one side of the building and waited for another person to enter the building. Five minutes later, he saw two men approaching the building. The guard asked the first man, "12 is equals to what?" The man answered, "6!" "Correct! You can enter the building." said the guard. Then the guard asked the second man, "6 is equals to what?" The second man answered, "3!" "Correct! You can enter the building." said the guard. Fizzy thought for a while and he proceeded to the entrance door again. The guard asked him, "10 is equals to what?" And Fizzy answered, "5!" "Wrong! You cannot enter the building." said the guard. What's the correct answer to the guard's question in order for Fizzy to enter the building?
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