This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Physiology
Delusion in delirium are 
Select and explain. 
A. Transient, B. Frightening, C. Self reference, D. Nihilistic
A: Transient
Answer: A: Transient 
Explanation: Delusion are only for sho time so transient in nature. It is the most characteristic feature of the delision. But they may be frightening in nature. So option A is the best answer.