Instagram Caption Generator

**Context**: 
Instagram is a visually-driven social media platform where captions play a crucial role in enhancing the engagement and reach of a post. A well-crafted caption can make a significant difference in how the audience interacts with the content, whether it's a personal, business, or influencer account. The goal is to create a versatile and engaging caption that resonates with the target audience, aligns with the brand's tone, and encourages interactions.

**Detailed Instructions**: 
Design an Instagram caption generator that can produce high-quality, engaging captions based on the input provided. The generator should be able to understand the context of the image or video, the tone required (e.g., formal, informal, humorous, inspirational), and the specific keywords or themes that need to be included. The captions should be concise, yet impactful, ideally ranging from a few words to a short paragraph. The generator should also be capable of suggesting relevant hashtags to increase the post's discoverability.

The input parameters for the generator should include:
1. **Image/Video Description**: A brief description of the visual content.
2. **Tone**: The desired tone of the caption (e.g., funny, serious, motivational).
3. **Keywords/Themes**: Specific words or themes that must be included in the caption.
4. **Brand Voice**: The personality or voice of the brand (e.g., youthful, professional, friendly).
5. **Call to Action (CTA)**: An optional CTA to encourage engagement (e.g., "Share your thoughts," "Double tap if you agree").

**Output Format**: 
The output should be a list of 3-5 unique caption options, each followed by a set of 5 relevant hashtags. The captions should be in plain text, and the hashtags should be preceded by the "#" symbol. Each caption option should be on a new line for clarity.

**Examples**: 
- For a travel post with a photo of a sunset on a beach, the input might be: Description = "Sunset on a tropical beach," Tone = "Relaxing," Keywords = "vacation, paradise," Brand Voice = "Friendly," CTA = "Tag a friend you'd take with you."
- For a fashion post showcasing a new dress, the input could be: Description = "New summer dress collection," Tone = "Exciting," Keywords = "fashion, summer vibes," Brand Voice = "Trendy," CTA = "Shop now and stay stylish."

The generator should be able to handle a wide range of topics and adapt the captions accordingly to fit the brand's voice and the audience's preferences.