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': 'Best forensic sample for DNA analysis is: TN 09 \nSelect and explain. \nA. Blood in EDTA, B. Hair, C. Vitreous humor, D. Femur bone', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Blood in EDTA', 'role': 'assistant'}]