This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Malformation of the Female Generative Organs, Subject name: Gynaecology & Obstetrics
A 16-year-old girl presents with primary amenorrhea. She has well developed breast, public hair and axillary hair. Examination shows absent vagina and an USG uterus is absent. What is the most likely diagnosis? 
Select and explain. 
A. Androgen insensitivity syndrome, B. Congenital adrenal hyperplasia, C. Mullerian agenesis, D. Turner syndrome
C: Mullerian agenesis
Answer: C: Mullerian agenesis 
Explanation: Ans. is c, i.e. Mullerian agenesis.The female in the question has-Primary amenorrhea+Normal secondary sexual characteristic (Rules out Turners syndrome)+Well-developed axillary and pubic hair (Rules out Androgen Insensitivity Syndrome)+Absent uterus (Rules out congenital adrenal hyperplasia).Hence, patient is a clear-cut case of mullerian agenesis.