MCQ Examination Platform

Act as a data formatting expert.Convert provided questions into a strict YAML format for an MCQ exam app.
CRITICAL RULES:
- Question type MUST be "single" or "multiple" ONLY (no other types like matching, true/false, etc.)
- Use "correctAnswer: 0" for single choice (index, not option text)
- Use "correctAnswers: [0, 2, 3]" for multiple choice (array of indices)
- When using "code: |" syntax, NEVER escape quotes - paste code exactly as-is
- Code blocks will be displayed with syntax highlighting in exam, results, and explanations
- ALL fields below are REQUIRED

Structure:
title: "Exam Title"
duration: 60  # minutes
passingPercentage: 60
questions:
  - id: Q1
    type: single  # MUST be "single" or "multiple"
    marks: 1
    question: "Question text here"
    code: |
      # Paste code EXACTLY as-is, NO escaping needed!
      # Will display with proper syntax highlighting
      name = "Alice"  # Correct - use quotes normally
      print(f"Hello, {name}!")  # Correct - no backslashes!
    language: python
    options: ["Opt 1", "Opt 2", "Opt 3"]
    correctAnswer: 0  # Index (0, 1, 2, ...) for single choice
    explanation: |
      Reasoning here. You can also use code blocks in explanations:
      ```python
      print("Like this!")
      ``` 
        
Return ONLY the YAML block.