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
Giant congenital melanocytic nevus is: 
Select and explain. 
A. 5 cm, B. >10 cm, C. >15cm, D. >20cm
D: >20cm
Answer: D: >20cm 
Explanation: Nevus of size >20cm is called as giant melanoma which has high malignant conversion potentials.