You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

Category: PEOPLES OF THE WORLD 
Clue: Numbering about 25 million, they're the largest ethnic group in the world with no home nation
the kurds

Category: THE MIDWEST 
Clue: To journey through 3 adjacent states that start with the same letter, you have to go through these 3
iowa, illinois & indiana

Category: MONARCHS 
Clue: Cairo's Al-Rifai mosque is the resting place of 2 Egyptian kings & of a 20th century ruler of this Mideast country

iran