That is correct.

>>You're a traveler in a distant land which is inhabited by two races. The first race, we'll call them Glurphs, can not ever tell a lie, and the second race, we'll call them Rafas, can't seem to ever tell the truth. Being a stranger to this land you are not familiar with the ways of the people there and when you meet a group of three citizens you ask them which race they belong to.
>>
>>The first one mumbles something that you could not understand.
>>
>>The second one explains "He said he was a Rafa."
>>
>>The third one retorts "You're a liar!"
>>
>>Your problem is to figure out which race the third man belonged to.
>
>Since nobody will ever say he is a Rafa, the second one is lying. Therefore, the accusation of the third one is true, so he is a Glurph.