This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Orbit, Subject name: Ophthalmology
[{'content': 'A tumor has the following characteristics - retrobulbar location within the muscle cone, well defined capsule, presents with slowly progressive proptosis, easily resectable, occurs most commonly in the 2nd to 4th decade. Most likely diagnosis is - \nSelect and explain. \nA. Capillary hemangioma, B. Cavernous hemangioma, C. Lymhangioma, D. Hemangiopericytoma', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. (b) Cavernuos hemangiomaRef: Kanski's 7/e, p. 105* Cavernous hemangioma is the most common benign, intraconal tumour in adults.* Presents with slowly progressive unilateral proptosis* CT - well circumscribed oval lesion, encapsulated", 'role': 'assistant'}]