This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pathology
Preformed mediator of inflammation is 
Select and explain. 
A. Serotonin, B. Prostaglandin, C. Dopamine, D. Leukotrienes
A: Serotonin
Answer: A: Serotonin 
Explanation: Chemical mediators of inflammation Cellular mediatorsPreformed mediators in secretory granulesNewly synthesizedHistamineSerotonin Lysosomal enzymes ProstaglandinsLeukotrienesPlatelet-activating factorActivated oxygen species Nitric oxide Cytokines Plasma mediatorsFactor XII activationComplement activationKinin system Coagulation / fibrinolysis system C3aC5aC3bC5b - 9 (Refer: Robbins & Cotran's - Pathologic Basis of Disease, SAE, 1st edition, Vol I-pg no: 82-85)