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
[{'content': 'Lines of Zahn occur in - \nSelect and explain. \nA. Postmortem clot, B. Infarct, C. Embolus, D. Coralline thrombus', 'role': 'user'}, {'content': 'Answer: D \nExplanation: It is seen in Primary platelet thrombi.', 'role': 'assistant'}]