{
  "week": 4,
  "title": "Pandas and Matplotlib",
  "questions": [
    {
      "q": "What is the main table structure in pandas?",
      "options": [
        "Workbook",
        "DataFrame",
        "Matrix",
        "Canvas"
      ],
      "answer": 1,
      "explanation": "DataFrame is the core tabular structure."
    },
    {
      "q": "Which function removes null rows?",
      "options": [
        "dropna",
        "clip",
        "rename",
        "astype"
      ],
      "answer": 0,
      "explanation": "dropna removes nulls."
    },
    {
      "q": "A histogram is best for showing?",
      "options": [
        "Text paragraphs",
        "Distribution of values",
        "Maps",
        "Passwords"
      ],
      "answer": 1,
      "explanation": "Histograms show distribution."
    }
  ]
}