{
  "question": "The equation E = mc^2 indicates that energy",
  "options": {
    "A": "equals mass moving at the speed of light squared.",
    "B": "equals moving mass.",
    "C": "is fundamentally different than mass.",
    "D": "and mass are closely related."
  },
  "answer": "D",
  "topk_tokens": [
    "mass-energy equivalence",
    "speed of light",
    "relationship between mass and energy"
  ],
  "uncertainties": [
    null,
    null,
    null
  ],
  "raw_output": "{\"concepts\": [\"mass-energy equivalence\", \"speed of light\", \"relationship between mass and energy\"]}"
}