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: Pharmacology
Most common characteristic of heat rupture: 
Select and explain. 
A. Irregular margin, B. Smooth and well defined margin, C. Clot in wound, D. Vessels rupture
A: Irregular margin
Answer: A: Irregular margin 
Explanation: Irregular margin