This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
Lines of Zahn are found in: 
Select and explain. 
A. Thrombus, B. Infarct tissue, C. Postmortem clot, D. All
A: Thrombus
Answer: A: Thrombus 
Explanation: None