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: Medicine
[{'content': "Elongated filaments in Pick's disease consist of - \nSelect and explain. \nA. Hyperphosphorylated tau, B. Ubiquitin, C. Alpha-synuclein, D. Beta-synuclein", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]