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: Psychiatry
Olfactory hallucinations are seen in: 
Select and explain. 
A. Temporal lobe epilepsy, B. Alzheimer's disease, C. Mesial temporal sclerosis, D. All
D: All
Answer: D: All 
Explanation: A,B,C All Correct