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': 'The concept of social medicine was first introduced by \nSelect and explain. \nA. Neumann and Virchow, B. Robe Grotjahn, C. John Ryle, D. Rene Sand', 'role': 'user'}, {'content': "Answer: A \nExplanation: The seeds that medicine is a social science were sown in 19th century by pioneers such as Neumann and Virchow Ref : Park's Textbook of Preventive and Social Medicine; 23rd edition", 'role': 'assistant'}]