This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Lines of zahn occur in which of the following 
Select and explain. 
A. Postmoem clot, B. Infract, C. Embolus, D. Coralline thrombus
D: Coralline thrombus
Answer: D: Coralline thrombus 
Explanation: Ref Robbins 9/e p 125 thrombi often have grossly and microscopically apparent laminations called lines of zahn,these represent pale platelet and fibrin deposit altered with red cell rich layers .such laminations represent that thrombus has formed in flowing blood.their presence can be therefore distinguish antemoem thrombus from the bland non lamentated clots occuring in postmoem clot