**Core Concept**
The question is testing the knowledge of a suitable anesthetic agent for day-care surgery, also known as outpatient surgery or ambulatory surgery. Day-care surgery requires anesthetic agents that have a rapid onset and recovery, minimal side effects, and a short duration of action.

**Why the Correct Answer is Right**
The anesthetic agent of choice for day-care surgery is Sevoflurane. Sevoflurane is a volatile anesthetic that is widely used for inducing and maintaining general anesthesia. It has a rapid onset of action, which allows for quick recovery, and is well-tolerated by patients. Sevoflurane also has a low risk of respiratory depression and nausea, making it an ideal choice for day-care surgery. Additionally, Sevoflurane is metabolized in the liver to a small extent, which reduces the risk of hepatotoxicity.

**Why Each Wrong Option is Incorrect**
**Option A:** Isoflurane is a volatile anesthetic but has a slower onset of action compared to Sevoflurane, making it less suitable for day-care surgery.
**Option B:** Desflurane is a potent volatile anesthetic but can cause airway irritation and respiratory depression, which are undesirable in day-care surgery.
**Option C:** Propofol is a popular intravenous anesthetic agent but can cause hypotension and nausea, which may not be ideal for day-care surgery.

**Clinical Pearl / High-Yield Fact**
Sevoflurane is a good choice for pediatric anesthesia due to its non-irritating properties and rapid recovery profile.

**Correct Answer: C. Propofol.**