Once upon a time, there was a strange island where only M and N tribe lived People of M tribe never tell the truth, people of N tribe always tell the truth One day, Xiao Zhang came to the island and met three people on the island  Xiao Zhang asked A:Are you a member of the M tribe?A answered  According to A's answer, B and Zhang said, A is not a member of the M tribe
C said, A is indeed a member of the M tribe
three.