Actually you're being fed the wrong logic here at the correction centre. The grammar books are telling you the right thing, because it just gels better with the sentence structure, and coming from the East I get why you're asking this question. Now comes the dissection: Somebody asking you from within the country. It's all contextual Where are you from ( which state)? I'm a New Yorker, or Californian or Texan. or I'm from Texas. Pretty much means the same thing, without a shred of a doubt for confusion. I get that half of Central Asia is ethnically Turk with my ethnicity being one but in this day and age a Turkish would only mean a Turkish national when asked in this context. The logic William gave could be counter applied to, ' I'm from Turkey ', as well '. Ok, so are you a refugee from Afghanistan living in Turkey would call yourself what? Holding a dual nationality in Canada, it boils down to what you choose to call yourself. Tiger Woods carries the most ethnically diverse lineage yet he chooses to call himself American. People who acquire dual nationalities, living back and forth between different countries like to call themselves what they like to call themselves. But grammatically you're not being eloquent with your answer.

Gramercy KartarS.

In the question they want to ask about the place. Instead of telling them about the place, you are telling them about yourself. Lets take a similar scenario. One day you got sick and went to doctors. Your friend didn't know where were you. So then, Friend: "Where were you?" You(incorrect): "I was sick" - This implies that you went to see doctor but Its not correct way to answer. You(correct): "I went to see doctor" Hopefully this helped or might have just added to your confusion :p

Much obliged Wililam, enough said.

You can, but, it’s not a precise answer to the question. And, for that reason, it’s wrong. You can be of Turkish ancestry but not be, strictly speaking, from Turkey. You can hold citizenship in a country you’re not actually from. You can be of dual ethnicity, confusing things even further.