This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
CD - 95 is a marker of - 
Select and explain. 
A. Death receptor, B. MHC complex, C. T helper cells, D. NK cells
A: Death receptor
Answer: A: Death receptor 
Explanation: Robbins basic pathology 6th edition. Chapter 1-cell injury. CD 95 is a marker of cell death. Fas or FasR, also known as apoptosis antigen 1 (APO-1 or APT), cluster of differentiation 95 (CD95) or tumor necrosis factor receptor superfamily member 6 (TNFRSF6) is a protein that in humans is encoded by the FAS gene.