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: Surgery
[{'content': 'Which of the following is the MOST common primary malignant tumor of spleen? \nSelect and explain. \nA. Angiosarcoma, B. Hamatoma, C. Secondaries, D. Lymphoma', 'role': 'user'}, {'content': "Answer: A \nExplanation: Primary neoplasm of spleen is a rare entity. Most common primary neoplasm of spleen is hemangioma and most common primary malignant tumor is angiosarcoma. Remember: Most common neoplasm of spleen is lymphoma Most common primary tumor of spleen is Hemangioma Most common primary malignant tumor of spleen is Hemangiosarcoma (or angiosarcoma) Ref: Sabiston 17/e, Page 1689; Maingot's 11/e, Page 1085; Bailey & Love 24/e, Page 1091", 'role': 'assistant'}]