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': "Which of the following test are used for arsenic poisoning -a) Marsh's testb) Reinsh's test c) Macewan's test d) Marqui's test \nSelect and explain. \nA. ac, B. a, C. ad, D. ab", 'role': 'user'}, {'content': "Answer: D \nExplanation: Marsh's test and Reinsh's test were used arsenic poisoning, but are obsolete now.", 'role': 'assistant'}]