This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
[{'content': 'A patient presents with symptoms of hypoglycemia. Investigations reveal decreased blood glucose and increased insulin levels. The c-peptide assay is done which shows normal levels of C-peptide. The most likely diagnosis is - \nSelect and explain. \nA. Insulinoma, B. Accidental sulfonylurea ingestion, C. Accidental exogenous insulin administration, D. Accidental metformin ingestion', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]