a) Differentiate between gas chromatography (GC) and high performance liquid chromatography (HPLC) (4 marks) b) A blood sample collected from a patient who had consumed alcohol suspected to be lazed with methanol was brought to the laboratory for analysis. Briefly explain how a GC-MS can be used to determine the presence of methanol in blood tissue. (4 marks) c) Using a suitable schematic diagram show the basic components of a GC installation and outline their functions (6 marks)