## Core Concept
A panel discussion is a format used in various settings, including medical education and conferences, where a small group of experts discuss a specific topic in front of an audience. The goal is to provide insights, debate, and sometimes reach a consensus on the topic. Panel discussions often involve a moderator.

## Why the Correct Answer is Right
Since the specific details of the options A, B, C, and D are not provided, let's discuss the general aspects of panel discussions. Typically, a panel discussion involves experts (panelists) who discuss a topic, and there might be a moderator to facilitate the discussion.

## Why Each Wrong Option is Incorrect
- **Option A:** Without the specific content of Option A, it's challenging to provide a direct explanation. However, if Option A states a characteristic that is commonly associated with panel discussions (e.g., involvement of experts, presence of a moderator, audience participation), it would be correct, not incorrect.
- **Option B:** Similarly, if Option B describes a typical feature of panel discussions, it would not be the correct answer to "except."
- **Option C:** This option would be incorrect if it aligns with standard practices or definitions related to panel discussions.
- **Option D:** This is marked as the correct answer, implying that the other options (A, B, C) are true statements about panel discussions, and Option D does not fit with these truths.

## Clinical Pearl / High-Yield Fact
A key aspect of a successful panel discussion is the engagement of the audience, which can be facilitated through questions, live polls, or interactive sessions. The moderator plays a crucial role in ensuring the discussion remains focused and productive.

## Correct Answer: D.