**Core Concept**
Gypsum, a naturally occurring mineral, is used in medicine for its hemostatic properties. It acts as a physical barrier to prevent bleeding and promote clotting. In medical settings, gypsum is often used in the form of plaster casts or dressings.

**Why the Correct Answer is Right**
Gypsum works by applying pressure to the affected area, which helps to constrict blood vessels and promote platelet aggregation. This physical pressure, combined with the inherent hemostatic properties of gypsum, allows it to effectively control bleeding. The mechanism of action involves the application of a physical stimulus to stimulate the body's natural clotting cascade.

**Why Each Wrong Option is Incorrect**
**Option A:** Gypsum is not used as a primary treatment for burns. While it may be used in some cases for wound management, its primary use is for hemostasis and immobilization.
**Option B:** Gypsum is not a type of antibiotic. Its hemostatic properties are due to its physical application, not its antimicrobial effects.
**Option C:** Gypsum is not used as a primary treatment for pain management. While it may provide some relief through immobilization, its primary use is for hemostasis.

**Clinical Pearl / High-Yield Fact**
Gypsum is often used in combination with other hemostatic agents, such as thrombin or oxidized cellulose, to enhance its effectiveness.

**Correct Answer: C. Gypsum is used as a hemostatic agent to control bleeding.**