**Core Concept**
Calcium hydroxide is a strong alkaline substance used in dentistry for its antimicrobial properties and ability to promote tissue repair. Its use as an intracanal medication is crucial in endodontic therapy, particularly between appointments.

**Why the Correct Answer is Right**
Calcium hydroxide is advocated as an inter-appointment intracanal medication because of its ability to dissolve organic matter, including necrotic tissue and bacteria, within the root canal. This process, known as "chemical debridement," helps to eliminate microorganisms and create a more favorable environment for subsequent procedures. The alkaline nature of calcium hydroxide also helps to raise the pH within the root canal, making it less conducive to bacterial growth.

**Why Each Wrong Option is Incorrect**
* **Option A:** Incorrect because this option doesn't make sense in the context of the question.
* **Option B:** Incorrect because it's not a valid reason for using calcium hydroxide as an inter-appointment intracanal medication.
* **Option D:** Incorrect because while calcium hydroxide does have some antimicrobial properties, this is not the primary reason it's used in this context.

**Clinical Pearl / High-Yield Fact**
Remember that calcium hydroxide can be toxic to the periapical tissues if left in the root canal for extended periods, so it's essential to monitor the patient's response and remove it before the next appointment.

**Correct Answer: C.**