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': 'In HIV number of helper T-4 cells (CD4) will be less than \nSelect and explain. \nA. 200, B. 600, C. 800, D. 1000', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]