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: Dental
[{'content': 'Hand over mouth technique was first described by \nSelect and explain. \nA. Dr. Evangeline Jordan, B. Addelson and Gold Fried, C. Dr. Goldman, D. Dr. G.V. Black', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]