You are in a room with five people. One of them will always tell you the truth. The other four will toggle between telling you the truth, and lying to you. However they can either tell you the truth OR lie on the first question you ask them. After that they must always toggle between that and the opposite. For example. I see one has a mustache, and he is a toggler. I ask - "Do you have a mustache?" "Yes." I ask again. "No." I ask again. "Yes." OR I ask - "Do you have a mustache?" "No." I ask again. "Yes." I ask again. "No." The challenge of the riddle is to ask exactly TWO questions to anyone. You can ask both questions to the same person or ask questions to two different people, and at the end of your two questions you must find out who the truth-teller is.
You must ask both questions to the same person.
Question 1: Are you the truth teller?
Question 2: (a) If the person responds "Yes". They are either the truth teller or they are a toggler that has just lied to you that will now tell you the truth. Either way the next answer will be truthful. Therefore ask who is the truth teller.
Question 2 (b) if the answer to question 1 is "no". They have to be a toggler that has just told you the truth. Therefore the next question will be a lie. Therefore the question " who is a toggler" will reveal the truth teller.