[
  {
    "description": "Test if they can distinguish different densities",
    "ttype": "question",
    "plots": [
      25,
      29,
      24,
      26
    ],
    "answer": 26
  },
  {
    "description": "Test if they can distinguish different densities",
    "ttype": "question",
    "plots": [
      25,
      22,
      31,
      24
    ],
    "answer": 31
  },
  {
    "description": "Test if they can distinguish different densities",
    "ttype": "question",
    "plots": [
      32,
      26,
      27,
      33
    ],
    "answer": 33
  }
]