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
Paradoxical excitation in children caused by 
Select and explain. 
A. Barbiturate, B. Narcotic, C. Nitrous oxide, D. None of the above
A: Barbiturate
Answer: A: Barbiturate 
Explanation: None