system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
The tissue of origin of the Kaposi's sarcoma is
assistant
The correct answer is  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)