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': 'While dispatching blood and urine chemical analysis sodium floride is added as preservative in the following concentration : \nSelect and explain. \nA. 30 mg/10m1, B. 40 mg/ 10 ml, C. 50 mg/ ml, D. 100 mg/10 ml', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. 100mg/10 ml', 'role': 'assistant'}]