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
[{'content': 'Which naevi commonly predispose to malignant melanoma ? \nSelect and explain. \nA. Dermal, B. Junctional, C. Congenital, D. Lentigo', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 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', 'role': 'assistant'}]