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: Ophthalmology
[{'content': "Bowen's disease is characterized by all except: \nSelect and explain. \nA. Predilection for the limbus, B. Poikilocytosis, C. Presence of monster cell, D. Being incapable of metastasizing", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Poikilocytosis', 'role': 'assistant'}]