This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Intravenous Anesthetic Agents, Subject name: Anaesthesia
What is incidence of emergence delirium after ketamine anaesthesia- 
Select and explain. 
A. 5% to 30 %, B. 30 % to 55 %, C. 55 % to 70 %, D. 100%
A: 5% to 30 %
Answer: A: 5% to 30 % 
Explanation: The observed incidence of emergence delirium after ketamine ranges from 5% to 30 %.