44. A 19-year-old woman was seen in the gynaecology clinic with a history of excessive growth of facial hair, needing to wax every 2-3 weeks. Her menstrual periods last 7-8 days every 24-35 days. There is no change in her voice. Her BMI is 28 kg/m2. Examination shows Ferriman-Gallwey grade 2-3 hirsutism over chest and abdomen. A pelvic ultrasound showed no abnormality. Her day two hormone tests showed LH level 7.4IU/L, FSH level 5.2IU/L, serum testosterone level 2.3nmol/l, SHBG 24 nmol/L.
What is the most likely diagnosis?