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: Forensic Medicine
[{'content': 'Dactylography is: \nSelect and explain. \nA. Surest sign of identification, B. Probabre sign of identification, C. Presumptive sign of identification, D. Doubtful sign of identification', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Surest sign of identification', 'role': 'assistant'}]