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': "Tests for detection of heavy metal: \nSelect and explain. \nA. Harrison's Gilroy test., B. Atomic absorption spectroscopy, C. Neutron activation analysis, D. All", 'role': 'user'}, {'content': 'Answer: D \nExplanation: A i.e. Harrison Gilroy test; B i.e. Atomic absorption Spectroscopy; C i.e. Neutron activation analysis', 'role': 'assistant'}]