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
[{'content': 'Marker of myeloid cancers: \nSelect and explain. \nA. S100, B. HMB45, C. Common leucocyte antigen, D. Cyto-keratin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: CD45 is present on all the leucocytes it is also known as leucocyte common antigen.(ref Robbins 8th/600,9/e p590)', 'role': 'assistant'}]