This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Biochemistry
[{'content': "Which of the following enzymes is known as 'suicide enzyme'? \nSelect and explain. \nA. Cyclooxygenase, B. Lipoxygenase, C. Phospholipase C, D. Xanthine oxidase", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Cyclooxygenase can switch off the synthesis of prostaglandins by undergoing self-catalysed destruction. That is why this enzyme is known as suicidal enzyme. (Do not confuse this with suicidal inhibition). Cyclooxygenase aka prostaglandin H synthase Bifunctional enzyme with two activities - cyclooxygenase and peroxidase. There are two isoenzymes of cyclooxygenase, COX-1 (Constitutive) and COX-2 (Inducible).', 'role': 'assistant'}]