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: Social & Preventive Medicine
[{'content': "Cource of a disease process without any' intervention is the definition of - \nSelect and explain. \nA. Spectrum of disease, B. Epidemiology of disease, C. Natural history of disease, D. Iceberg phenonenon", 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Natural history of disease o Natural history of disease signifies the way in which a disease evolves over time from the earliest stage of its prepathogenesis phase to its termination as recovery, disability or death, in the absence of treatment or prevention.", 'role': 'assistant'}]