Which of the following medications is known to treat nausea and vomiting in addition to anxiety?

The correct choice is known for its dual ability to address both anxiety and nausea/vomiting. Certain medications classified as antianxiety can have indications for treating nausea and vomiting, particularly those that impact the central nervous system. For instance, benzodiazepines, a common subtype of antianxiety medications, can be effective in managing anxiety symptoms and have been used in some cases to help alleviate nausea, especially when anxiety contributes to the feeling of sickness.

Other medication classes listed do not have this dual indication. Antibiotics are primarily focused on bacterial infections and do not typically affect nausea or vomiting directly. Anticholinergics can be used to treat motion sickness and may help with nausea, but they are not routinely utilized for anxiety management. Antidepressants primarily target mood disorders and may have some use in anxiety treatment; however, their primary function is not to treat nausea and vomiting.

Thus, the antianxiety category is distinct in its combined therapeutic effects, making it the correct choice for addressing both conditions mentioned in the question.