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': 'True about mural thrombi \nSelect and explain. \nA. Common in small blood vessels of heart, B. Appear as dark red in color, C. Occur in large vessels like, heart and Aorta, D. Are commonly seen in lungs', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]