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
Which of the following can determine malignant conversion of nevi better? 
Select and explain. 
A. Size, B. Colour, C. Site, D. Number
D: Number
Answer: D: Number 
Explanation: Number of nevi is the better indicator of malignant conversion. More the number of nevi, more the chances of malignancy.