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: Surgery
[{'content': 'After 4 weeks of Head trauma, pt. presents with features of irritability and altered sensorium. Commonest cause will be - \nSelect and explain. \nA. Chronic subdural hematoma, B. Extradural hematoma, C. Intraparenchymal bleed, D. Electrolyte imbalance', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]