This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Naevi and vessel related disorders, Subject name: Dental
The 585-nm pulsed dye laser is an effective Rx for following except: 
Select and explain. 
A. Icthyosis, B. Vascular lesions, C. keloidal scars, D. Molluscum contagiosum
A: Icthyosis
Answer: A: Icthyosis 
Explanation: The 585-nm pulsed dye laser is an effective treatment for: Molluscum contagiosum. Keloidal scars. Vascular lesions Treatment of Icthyosis: Topical emmolients Systemic steroids