Anaesthetic agent which is explosive in the presence of cautery :
**Core Concept**
The question is testing the knowledge of volatile anaesthetic agents and their properties. Volatile anaesthetic agents are commonly used in inhalational anaesthesia and can be explosive in the presence of heat sources like cautery.
**Why the Correct Answer is Right**
The correct answer is a volatile anaesthetic agent that is highly flammable and can ignite in the presence of heat, such as cautery. This is due to its low flash point and high vapour pressure, which makes it prone to ignition. When a volatile anaesthetic agent comes into contact with a heat source, the vapour can ignite, leading to a fire or explosion.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is a benzodiazepine, a class of sedatives and anxiolytics, which are not volatile anaesthetic agents and are not explosive in the presence of cautery.
**Option B:** This option is an opioid, a class of analgesics, which are not volatile anaesthetic agents and are not explosive in the presence of cautery.
**Option C:** This option is an inhalational anaesthetic agent, but it is not as flammable as the correct answer.
**Clinical Pearl / High-Yield Fact**
When using volatile anaesthetic agents, it is essential to ensure that the operating room is well-ventilated and that all heat sources, including cautery, are turned off before administering the agent.
**Correct Answer: C. Halothane. Halothane is a volatile anaesthetic agent that is highly flammable and can ignite in the presence of heat, such as cautery.**