There is a really interesting island in the middle of Pacific Ocean. There are only two villages on the island, village A and village B. All villagers in A are speaking only truth and nothing but the truth. All villagers in B are liars, they never tell the truth.

If you meet a man on the beach, and you want to ask him if the fruit you just picked from the tree is safe to eat, how would you know he is telling the truth? What question should you ask him first that will establish whether he is a truth speaker from A or a liar from B? And make sure you get the answer right, 'cause there is no McDonalds on the island, and all there is to eat are these fruits