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: Dental
Most common cause of pulp pathology is: 
Select and explain. 
A. Microbes, B. Trauma, C. Leakage from filling materials, D. Pressure sensation from condensation of filling materials
A: Microbes
Answer: A: Microbes 
Explanation: None