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
Elongated filaments in Pick's disease consist of - 
Select and explain. 
A. Hyperphosphorylated tau, B. Ubiquitin, C. Alpha-synuclein, D. Beta-synuclein
A: Hyperphosphorylated tau
Answer: A: Hyperphosphorylated tau 
Explanation: None