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: Dental
[{'content': 'Giant congenital melanocytic nevus is: \nSelect and explain. \nA. 5 cm, B. >10 cm, C. >15cm, D. >20cm', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Nevus of size >20cm is called as giant melanoma which has high malignant conversion potentials.', 'role': 'assistant'}]