This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiration, Subject name: Pathology
[{'content': 'All are true about silicosis except? \nSelect and explain. \nA. Bifringent crystals seen, B. Pleural plaque seen, C. Lower lobe is ussualy involved, D. Most common pnemoconiosis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. (c) Lower lobe is ussualy involved(Ref: Robbins 9th/pg 689; 8th/pg 687)Silicosis involves upper lobe more commonly than lower lobe. Examination of the nodules by polarized microscopy reveals the birefringent silicate particles (silica is weakly birefringent).', 'role': 'assistant'}]