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
Which of the following is most acceptable theory explaining development of endometriosis 
Select and explain. 
A. Coelomic metaplasia, B. Retrograde menstruation, C. Lymphatic spread, D. Mullerian remnants outside uterus
B: Retrograde menstruation
Answer: B: Retrograde menstruation 
Explanation: Sampson's Theory of Retrograde menstruation is the most favoured theory explaining endometriosis.