title: Tehran
context: Tehran (/tɛəˈræn, -ˈrɑːn, ˌteɪə-/; Persian: تهران‎ Tehrân [tehˈɾɒːn](listen)) is the capital of Iran and Tehran Province. With a population of around 8.4 million in the city and 15 million in the larger metropolitan area of Greater Tehran, Tehran is the most populous city in Iran and Western Asia,[6] and has the second-largest metropolitan area in the Middle East. It is ranked 29th in the world by the population of its metropolitan area.[7]
question: What is the origin of the word Tehran?
answers: Persian