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': 'Bleeding disorder with ↑ a PTT is/are -a) Hemophilia Ab) Hemophilia Bc) Henoch-schonlein purpurad) Bernard-soulier syndromee) Von-Willebrand disease \nSelect and explain. \nA. abe, B. bcd, C. cde, D. acd', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]