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
A: Nitrazepam
Answer: A: Nitrazepam 
Explanation: Safe in asthma → Propofol, etomidate, ketamine, vecuronium, rocuronium, Pancuronium, Halothane, Sevoflurane, Desflurane, Isoflurane, Pethidine, Fentanyl, Alfentanil, Benzodiazepines (Nitrazepam).