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
Nevus achromicus and Nevus anemicus can be differentiated by: 
Select and explain. 
A. Hypopigmented lesions, B. Immunofluroscence, C. Diascopy, D. Huctchinson's sign
C: Diascopy
Answer: C: Diascopy 
Explanation: Lesions in Nevus depigmentosus will not increase in size as the borders does not merge into surrounding skin on Diascopy. (Pressing with a glass slide)
Whereas borders get merged and there will be increase in size in Nevus anemicus, on Diascopy.