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': 'Heroin abuse causes ? \nSelect and explain. \nA. Focal segmental glomerulonephritis, B. Cresent glomerulonephritis, C. Membraneus glomerulonephritis, D. Diffuse glomerulonephritis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Answer- A. Focal segmental glomerulonephritisClinically it presents as nephrotic syndrome.CausesHIV infectionHeroin addictionSickle cell diseaseMassive obesityIgA nephropathyReflux nephropathyIdiopathic', 'role': 'assistant'}]