A 16-year old girl was brought with primary amenorrhea. Her mother mentioned that she staed developing breast at the age of 12. She was prescribed OCPs 2 years back by a doctor with no effect. She was having normal stature and was a football player. On examination, breasts were well developed (Tanner's stage 5) and pubic hair was minimal (Tanner's stage 1). What is the most probable diagnosis?