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
The most constant early symptom of uterine rupture during labour is : 
Select and explain. 
A. Shock, B. Pain, C. Vaginal bleeding, D. Cessation of labour
B: Pain
Answer: B: Pain 
Explanation: Pain