This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Disorders of menstruation, Subject name: Gynaecology & Obstetrics
A 33 years old female presents with a history of 6months of amenorrhea. Biochemical investigations showed increased FSH and decreased Estradiol. Diagnosis is 
Select and explain. 
A. PCOD, B. Hyperprolactinemia, C. Premature menopause, D. Ectopic pregnancy
C: Premature menopause
Answer: C: Premature menopause 
Explanation: Premature menopause: Menopause setting before the age of 40 years 50 % reduction in androgen production 66% reduction in the oestrogen production FSH levels rise to as much as 50 fold Ref: Shaw Gynecology 17 e pg 87.