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
Which naevi commonly predispose to malignant melanoma ? 
Select and explain. 
A. Dermal, B. Junctional, C. Congenital, D. Lentigo
C: Congenital
Answer: C: Congenital 
Explanation: Malignant transformation is rare and occurs in the following situations: Congenital melanocytic naevi:6% of lesions undergo malignant change , risk of malignant transformation is greater in giant lesions. Dysplastic naevus syndrome: in melanoma prone families. From illustrated synopsis of dermatology and sexually transmitted diseases neena khanna 5th edition page no 382