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
Which of the following is not steroid? 
Select and explain. 
A. Estrogen, B. Cholic acid, C. Leukotrians, D. Vitamin D
C: Leukotrians
Answer: C: Leukotrians 
Explanation: 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