This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neoplasia, Subject name: Surgery
Which melanoma is malignant 
Select and explain. 
A. Juctional, B. Blue nevus, C. Intra dermal, D. None
A: Juctional
Answer: A: Juctional 
Explanation: (Junctional) (43- Bailys love 20th)A. Malignant melanoma may ariseA. de - novo in apparently normal skinB. In a preexisting prigmented nevus Malignant changes in a benign nevus occurs only in the JUNCTIONAL or compound variety. Pure dermal naevus is safe