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
A child with erythematous non-blanching bosselated lesion on right side of the face, Rx is – 
Select and explain. 
A. Erbium laser, B. Nd–YAG laser, C. Flash light pumped dye laser, D. Q ruby laser
C: Flash light pumped dye laser
Answer: C: Flash light pumped dye laser 
Explanation: "Non blanching bosselated lesion on right side of the face suggests port wine stain"
Treatment of choice for port-wine stain is a yellow-pulsed dye laser often along with cryogen spray cooling.