A 17 year old girl comes to see you because she has not started her periods. She has always been shorter than her friends, and is below the third centile of height for her age. The rest of her family are of normal height. On examination she has no breast development and no pubic hair development. What is the most likely diagnosis?
1) Turner syndrome
2) Klinefelter syndrome
3) Androgen insensitivity syndrome
4) Congenital adrenal hyperplasia