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: Pathology
[{'content': 'The Earliest feature Tuberculosis is: \nSelect and explain. \nA. Caseation, B. Lymphocytosis, C. Giant calls (Langerhans), D. Granuloma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Lymphocytosis', 'role': 'assistant'}]