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
All of the following show false negative result on EPT (electric pulp testing) except: 
Select and explain. 
A. Teeth with calcified canal, B. Immature teeth, C. Sedated patient, either alcohol or drugs, D. Moist gangrenous pulp
D: Moist gangrenous pulp
Answer: D: Moist gangrenous pulp 
Explanation: None