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: Unknown
[{'content': 'Littoral cell angioma is: \nSelect and explain. \nA. Tumor of spleen, B. Angiomatous lesion of skin, C. Angioblastic tumor of Cerebellum, D. Congenital vascular anomaly at base of brain', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Littoral cell angioma\n• Is a benign, vascular tumor of spleen presenting as spleenomegaly\n• It may be associated with other malignancies and has malignant potential itself\n• The tumor arises from the littoral cells in the splenic red pulp sinuses. Littoral cell angioma affects both men and\nWomen equally with no specific age predilection\n• It is usually asymptomatic and is discovered incidentally\n• Some of the patients with this entity may present with symptoms of hypersplenism such as anemia,\nthrombocytopenia, and splenomegaly, the latter seen in almost all patients with littoral cell angioma', 'role': 'assistant'}]