This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Enzymes, Subject name: Biochemistry
Marker enzyme for plasma membrane is: 
Select and explain. 
A. 5'Nucleotidase, B. Catalase, C. Acid Phosphatase, D. GGT
A: 5'Nucleotidase
Answer: A: 5'Nucleotidase 
Explanation: Ans. A. 5'NucleotidaseMembrane/organelleMarker enzymesPlasma Membrane5'-Nucleotidase Adenylyl Cyclase Na+-K+ ATPaseEndoplasmic reticulumGlucose-6-phosphataseGolgi ComplexGalactosyl TransferaseQInner Mitochondrial Membrane ATP SynthasePeroxisomeCatalase, Urate OxidaseLysosomesAcid PhosphataseCytoplasmLactate Dehydrogenase