This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Gynaecology & Obstetrics
Premature menopause is when menopause occurs before 
Select and explain. 
A. 55 years, B. 50 years, C. 45 years, D. 40 years
C: 45 years
Answer: C: 45 years 
Explanation: Premature menopause is when menopause occurs before 45 years.