This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urology, Subject name: Surgery
The best cosmetic results for large capillary (po wine) hemangiomas are achieved by 
Select and explain. 
A. Excision and split-thickness skin, B. Laser ablation, C. Cryosurgery, D. Tattooing
B: Laser ablation
Answer: B: Laser ablation 
Explanation: .Po wine stain (Naevus flammeus): It presents at bih and persists throughout life without any change. Spontaneous regression will not occur. It presents as smooth, flat, reddish blue/intensely purple area; common in head, neck and face; often with maxillary and mandibular dermatomes of 5th cranial nerve. Eventually surface becomes nodular and keratotic. * It persists throughout life. * It is actually a capillary malformation even though considered under haemangioma. It results from defect in maturation of sympathetic innervation of skin causing localised vasodilatation of intradermal capillaries. * It is often associated with Sturge-Weber syndrome, Klippel - Trenaunay-Weber syndrome and Proteusnsyndrome. * It needs treatment - laser (pulsed dye/diode); excision and grafting; cosmetic coverage. Expected result by treatment is not possible many times. ref:SRB&;s manual of surgery,ed 3,pg no 180