**Core Concept**
The question is referring to a method of communication that emphasizes experiential learning and hands-on experience. This method is essential in medical education, as it allows students to apply theoretical knowledge in practical situations, thereby enhancing their understanding and retention.

**Why the Correct Answer is Right**
The correct answer is **C. Demonstration**. Demonstration is a method of communication where the instructor shows the student how to perform a task or procedure. This hands-on approach allows the student to learn by observing and then practicing the skill under the supervision of the instructor. Demonstration is an effective way to learn complex skills, such as surgical techniques or medical procedures, as it provides a clear visual representation of the steps involved.

**Why Each Wrong Option is Incorrect**
**Option A:** Lecture is a method of communication where the instructor talks to the students, but it does not involve hands-on experience or experiential learning. Lecture is a more didactic approach to learning, where the students are passive recipients of information.

**Option B:** Discussion is a method of communication where the students and instructor engage in a conversation about a topic. While discussion can be an effective way to learn, it is not necessarily a hands-on or experiential approach to learning.

**Option D:** Written instructions are a method of communication where the information is conveyed through written text. Written instructions can be helpful, but they do not provide the same level of hands-on experience as demonstration.

**Clinical Pearl / High-Yield Fact**
The key to effective learning is to combine theoretical knowledge with practical experience. Demonstration is an essential method of communication in medical education, as it allows students to apply their knowledge in real-world situations.

**Correct Answer: C. Demonstration**