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: Anaesthesia
Which is safest to be used in asthmatic patients: 
Select and explain. 
A. Nitrazepam, B. Phenobarbitone, C. Chloral hydrate, D. All hypnotics are safe
C: Chloral hydrate
Answer: C: Chloral hydrate 
Explanation: C i.e. Chloral hydrate