We should tell them the truth and facts. Because if we don't, others will. Although Iran is home to many races and ethnic groups, the predominant race of the country has been and is Aryan. But that's not necessarily true. Those features are the Nordic Aryan features which Hitler picked as the features of the supreme race.
Aryan features vary from fair skin and blond hair to brown skin and dark hair.
Many years ago, in the days of the hostage crisis and all that, when Iranians were hated by almost everyone here, I was approached in a shooting gallery by a man admiring my markmanship. He asked where I had learned to shoot so well. I laughed at him and told him to go to hell. But the fact that he knew so much about a narrow aspect of Iranian culture and background has remained with me. I always have had to educate the Americans about the fact that Iranians are not Arabs.