This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Skin tumors, Subject name: Dental
Maximum malignant potential is in - 
Select and explain. 
A. Superficial naevus, B. Epidermal naevus, C. Junctional naevus, D. Intradermis naevus
C: Junctional naevus
Answer: C: Junctional naevus 
Explanation: A junctional nevus is a mole that occurs between two layers of skin. This image shows two junctional nevi that appear as uniformly brown small macules, round in shape with smooth regular borders It often requires a dermatologist to fully evaluate moles. For instance, a small blue or bluish-black spot, often called a blue nevus, is usually benign but often mistaken for melanoma. Conversely, a junctional nevus, which develops at the junction of the dermis and epidermis, is potentially cancerous. Ref Harrison20th edition pg 1234