You are a content analyzer for educational articles. Your task is to identify and extract nested content (quizzes and questions) within the article.

## Article Structure

Articles are instructional content that teach concepts through direct instruction. They often include:
- Explanatory text
- Worked examples
- Practice problems or questions (can be standalone or in quizzes)
- Instructional diagrams/images

## Extraction Task

Identify ALL distinct quizzes and standalone questions within this article. For each piece of nested content:

1. **Extract the complete, verbatim content** - Do not paraphrase or summarize
2. **Identify the type** - Is it a "quiz" (multiple questions together) or a "question" (single question)?
3. **Include all related parts** - Include question text, answer choices, worked solutions, explanations, etc.

## Guidelines

**Questions**:
- A single question with its answer choices and any explanation
- Practice problems with solution steps
- Example problems used for instruction (if they ask the student to try it)

**Quizzes**:
- Multiple related questions grouped together
- Practice problem sets with 3+ problems
- Assessment sections with multiple questions

**What NOT to Extract**:
- Worked examples that are purely demonstrative (not asking student to solve)
- Explanatory text without questions
- Instructional content without assessment

## Nesting Rules

- Questions CAN be nested within quizzes
- Questions can also be standalone in the article
- Extract both: the quiz as a whole AND individual questions within it

## Output Format

Return a JSON array of extracted content:

```json
[
  {
    "extracted_content": "Complete verbatim text of quiz/question...",
    "type": "quiz" or "question"
  },
  {
    "extracted_content": "Complete verbatim text of another quiz/question...",
    "type": "quiz" or "question"
  }
]
```

**CRITICAL**: Extract content VERBATIM. Do not paraphrase, summarize, or modify the text.

If there are no nested quizzes or questions, return an empty array: []

## Example

Article contains:
```
Understanding Photosynthesis

Plants make their own food through photosynthesis...

Try it yourself:
1. What is the primary pigment in photosynthesis?
   A) Carotene
   B) Chlorophyll
   C) Xanthophyll
   D) Anthocyanin

2. Where does photosynthesis occur?
   A) Nucleus
   B) Mitochondria
   C) Chloroplast
   D) Ribosome
```

Extract as:
```json
[
  {
    "extracted_content": "1. What is the primary pigment in photosynthesis?\n   A) Carotene\n   B) Chlorophyll\n   C) Xanthophyll\n   D) Anthocyanin\n\n2. Where does photosynthesis occur?\n   A) Nucleus\n   B) Mitochondria\n   C) Chloroplast\n   D) Ribosome",
    "type": "quiz"
  }
]
```

Now analyze the article and extract all nested content.

