This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Concept of health and disease, Subject name: Social & Preventive Medicine
[{'content': 'Theory of web of causation was given by \nSelect and explain. \nA. Mc Mohan and Pugh, B. Petfenkoffer, C. John snow, D. Louis Pasteur', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Theory of web of causation was proposed by MacMahon and Pugh in their book: "Epidemiological Principles and Methods". Web of causation considers all the predisposing factors of any type and their complex inter-relationship with each other. Ref : Park&;s Textbook of Preventive and Social Medicine; 23rd edition; Page 34', 'role': 'assistant'}]