Which anaesthetic agent is known for its antiemetic properties?

Propofol is known for its antiemetic properties, making it the correct choice in this context. One of the notable characteristics of Propofol is its ability to significantly reduce the incidence of postoperative nausea and vomiting, which are common side effects associated with various anesthetic techniques. This attribute makes it particularly advantageous in managing patients who are prone to these side effects.

In contrast, Thiopental is primarily a rapid-acting barbiturate used for induction of anesthesia but does not possess significant antiemetic effects. Halothane, while a widely used inhalational anesthetic, is less commonly utilized now due to its potential hepatotoxicity and does not provide notable antiemetic benefits. Isoflurane, another inhalational anesthetic, is well-tolerated but is not recognized for its antiemetic properties like Propofol. Therefore, Propofol's unique ability to mitigate nausea and vomiting makes it stand out among these agents.