This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Pathology
[{'content': "The tissue of origin of the Kaposi's sarcoma is \nSelect and explain. \nA. Lymphoid, B. Vascular, C. Neural, D. Muscular", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Kaposi sarcoma (KS) is a vascular neoplasm caused by Kaposi sarcoma herpesvirus (KSHV, also known as human herpesvirus- 8, or HHV-8). Although it occurs in a number of contexts, it is by far most common in patients with AIDS; indeed, its presence is used as a criterion for the diagnosis. (Robbins basic pathology,9th edition,pg no.360)', 'role': 'assistant'}]