**Core Concept**
Health education charts are a visual tool used to convey information and promote awareness among groups. They can be used in various settings, including public health campaigns, educational institutions, and community programs.

**Why the Correct Answer is Right**
Flip charts are a type of visual aid that consists of a series of charts or diagrams displayed in sequence, often accompanied by a narrative or discussion. They are commonly used in educational and training settings to present information in a clear and concise manner. The use of flip charts allows for a dynamic and engaging presentation, as the content can be easily updated or modified to suit the needs of the audience. This makes them an effective tool for health education, enabling presenters to convey complex information in a way that is easy to understand.

**Why Each Wrong Option is Incorrect**
**Option A:** Flannel graph refers to a type of visual aid that uses flannel or felt boards to create images or scenes. While it can be used for educational purposes, it is not typically used for serially flashing information to a group.
**Option B:** Flash cards are small cards with information or questions printed on them, often used for self-testing or review purposes. They are not designed for serially flashing information to a group.
**Option D:** Exhibition charts are typically used in a static display setting, such as a museum or exhibition hall, and are not designed for sequential presentation.

**Clinical Pearl / High-Yield Fact**
When using visual aids like flip charts, it is essential to ensure that the content is clear, concise, and easy to understand. This can be achieved by using simple language, avoiding clutter, and using visual elements that support the message.

**✓ Correct Answer: C. Flip charts**