This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Haematology, Subject name: Anatomy
Marker of myeloid cancers: 
Select and explain. 
A. S100, B. HMB45, C. Common leucocyte antigen, D. Cyto-keratin
C: Common leucocyte antigen
Answer: C: Common leucocyte antigen 
Explanation: CD45 is present on all the leucocytes it is also known as leucocyte common antigen.(ref Robbins 8th/600,9/e p590)