This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Biochemistry
[{'content': 'Which of the following is not steroid? \nSelect and explain. \nA. Estrogen, B. Cholic acid, C. Leukotrians, D. Vitamin D', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Leukotrienes are a family of inflammatory mediators produced in leukocytes by the oxidation of arachidonic acid (AA) and the essential fatty acid eicosapentaenoic acid (EPA) by the enzyme arachidonate 5-lipoxygenase.Ref: DM Vasudevan, 7th edition, page no: 190', 'role': 'assistant'}]