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
[{'content': 'LDH has following number of isoenzymes: \nSelect and explain. \nA. 5, B. 3, C. 11, D. 2', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A. 5Enzyme and its isoenzyme both catalyse the same reaction but exhibit different physical and chemical properties. Isoenzymes are common in sera and tissues of all vertebrates, insects, plants and unicellular organisms.', 'role': 'assistant'}]