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
Tests for detection of heavy metal: 
Select and explain. 
A. Harrison's Gilroy test., B. Atomic absorption spectroscopy, C. Neutron activation analysis, D. All
D: All
Answer: D: All 
Explanation: A i.e. Harrison Gilroy test; B i.e. Atomic absorption Spectroscopy; C i.e. Neutron activation analysis