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': 'Helsinki declaration is for: \nSelect and explain. \nA. Ethical duties and rules for dentists in general practice, B. Ethical duties and rules for physicians in general practice, C. Ethical duties for biomedical research involving human subjects, D. All of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]