This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Principles of Epidemiology, Subject name: Social & Preventive Medicine
[{'content': 'Components of epidemiological triad are all except \nSelect and explain. \nA. Environment, B. Agent, C. Host, D. Pathogenesis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. (d) PathogenesisThe causative factors of disease include AGENT, HOST, ENVIRONMENT . These 3 are referred as Epidemiological triad. Interaction of these 3 factors is required for development of disease .', 'role': 'assistant'}]