{
  "cell_id": "q111_hard_negative_k4",
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  "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": 4,
  "source_position": "first",
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