**Core Concept**
A flip chart is a visual aid used to present information in a series of posters or panels, typically used for educational or presentational purposes. This tool is designed to facilitate communication and engagement by providing a clear and concise overview of a subject.

**Why the Correct Answer is Right**
A flip chart is a specific type of visual aid that consists of a series of connected posters or panels, usually made of cardboard or plastic. This format allows for easy navigation and comprehension of complex information. The use of a flip chart enables presenters to convey a wealth of information in a concise and visually appealing manner, making it an effective tool for education and communication.

**Why Each Wrong Option is Incorrect**
**Option A:** A flannel graph is a type of visual aid, but it typically consists of a large flannel board with cut-out figures or objects, rather than a series of posters or panels.
**Option B:** An exhibit is a display or presentation of information, but it can take many forms and is not limited to a series of connected posters or panels.
**Option C:** A model is a three-dimensional representation of an object or concept, which is not necessarily a series of posters or panels.

**Clinical Pearl / High-Yield Fact**
When using visual aids like flip charts, it's essential to keep the information concise, clear, and visually appealing to engage your audience effectively.

**✓ Correct Answer: D. Flip chart**