A 21-year-old woman presents with complaints of primary amenorrhoea. Her height is 153 cms, weight is 51 kg. She has well-developed breasts. She has no public or axillary hair and no hirsutism. Which of the following is the most probable diagnosis-
Turner's Syndrome : (Gonadal dysgenesis)

A phenotypic female presents with primary amenorrhea. Public and axillary hairs remain sparse and breasts are infantile (patient in question has mature breasts)

Stein Leventhal syndrome : (Polycystic ovarian disease)

This is characterized by Hirsuitism (patient in question has no hirsutism) along with amenorrhea/oligomenorrhea, obesity and infertility.

Premature ovarian failure: Presents with secondary amenorrhea and not primary amenorrhea.
Turner's syndrome
Stein-Leventhal syndrome
Premature ovarian failure
Complete androgen insensitivity syndrome