{
  "question": "In a hydraulic press operation, the output piston cannot",
  "options": {
    "A": "move farther than the input piston",
    "B": "exceed the force input",
    "C": "exceed the input piston’s speed",
    "D": "produce increased energy"
  },
  "answer": "D",
  "topk_tokens": [
    "hydraulic press principles",
    "force and pressure relationship",
    "energy conservation in machines"
  ],
  "uncertainties": [
    null,
    null,
    null
  ],
  "raw_output": "{\"concepts\": [\"hydraulic press principles\", \"force and pressure relationship\", \"energy conservation in machines\"]}"
}