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: Pathology
Pain due to acute irreversible pulpitis is: 
Select and explain. 
A. Spontaneous, B. Sharp-shock like, C. Lasting for short time, D. Continuous
A: Spontaneous
Answer: A: Spontaneous 
Explanation: None