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': "In primary T.B. seen - \nSelect and explain. \nA. Ghon's focus, B. Pleural effusion, C. Miliary mottling, D. Fibrosis", 'role': 'user'}, {'content': "Answer: A \nExplanation: Primary T.B. includes.\n\n\nAn area of grey-white (size of approx. 1 - 1.50 cm) inflammatory consolidation - called ghon's focus.\nLymph node.\nLymphatics and lymphatic channel.\n\n\nCavity and fibrosis is seen in secondary T.B.", 'role': 'assistant'}]