Question

You are on an island with two tribes. One tribe always tells the truth, and the other tribe always lies. You meet three individuals from the island: A, B and C. Each individual belongs to one of the tribes. You ask each of them the same question: "Is B a truth-teller?" 
A says, "Yes, B is a truth-teller."
B says, "No, I am not a truth-teller."
C says, "B is a liar."

• A. Both B and C
• B. A only
• C. C only
• D. B only

Hint:

Always test self-referential or paradoxical statements for consistency. They often point directly to who is lying.

Answer 1

The Correct Option is C

Step 1: Analyze B's statement. 
B says, "No, I am not a truth-teller." If B were telling the truth, then he wouldn't be a truth-teller, which is a contradiction.
Hence, B is lying, so B is a liar. 
Step 2: Analyze A's statement. 
A says B is a truth-teller. But we just proved B is a liar, so A must be lying too. 
Step 3: Analyze C's statement. 
C says B is a liar. That’s a true statement, so C must be a truth-teller. 
Conclusion: C is telling the truth; A and B are lying.