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 -a) Harrison's Gilroy testb) Atomic absorption spectroscopyc) Neutron activation analysisd) Partition activation analysise) Thin layer chromatography 
Select and explain. 
A. ab, B. bc, C. abc, D. bcd
C: abc
Answer: C: abc 
Explanation: None