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
All are true about spasmodic dysmenorrhea EXCEPT : 
Select and explain. 
A. Present just before menstruation, B. Present after 3rd day of menstrual period, C. The pain may persist for 12 - 24 hours, D. Dyspareunia
B: Present after 3rd day of menstrual period
Answer: B: Present after 3rd day of menstrual period 
Explanation: Present after 3rd day of menstrual period