This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
[{'content': "80 year old, asymptomatic man present with a Total leucocyte count of 1 lakh, with 80% lymphocytes and 20% FMC's. What is the most probable diagnosis - \nSelect and explain. \nA. HIV, B. CML, C. CLL, D. TB", 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]