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 marker for cytotoxic- 
Select and explain. 
A. CD 4, B. CD 8, C. CD 21, D. CD 45
B: CD 8
Answer: B: CD 8 
Explanation: harshmohan textbook of pathology 7th edition. *T suppressor cells ,they suppresses immune reaction but are cytotoxic and actually destroy the invading antigen.these cells (cytotoxic T lymphocytes) carry CD8 molecules on their surface and hence are also called CD8+ cells.