This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Systemic Bacteriology (Gram Positive Bacilli, Gram Negative Bacilli), Subject name: Microbiology
[{'content': 'Most common extra pulmonary involvement of TB ? \nSelect and explain. \nA. Bone, B. Lymph nodes, C. Pleura, D. Ileocecal', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Most common extra pulmonary involvement: lymph nodes > pleura> ileocecal - GI TB most common site- ileocecal', 'role': 'assistant'}]