{
  "cell_id": "q111_hard_negative_k2",
  "doc_id": "bariumswallowpresentation-090810084400-phpapp01_95.pdf",
  "question": "In the deck's double-contrast esophagus technique, the patient swallows a measured amount of high-density, low-viscosity barium and is then given effervescent powder. What volume of that barium is given to swallow?",
  "answer": "15-20 ml",
  "answer_format": "Str",
  "condition": "hard_negative",
  "k": 2,
  "source_position": "first",
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  "dpi": 150,
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      "role": "source",
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      "pages": 77,
      "image_dir": "images/bariumswallowpresentation-090810084400-phpapp01_95"
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    {
      "role": "hn_1",
      "doc": "resize_r2_23",
      "pages": 18,
      "image_dir": "images/resize_r2_23"
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      "role": "hn_2",
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