This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Oral cavity, Subject name: Surgery
All of the following are true about carcinoma lip except: 
Select and explain. 
A. Non-healing ulcer or growth is the most common presentation, B. Most common site is vermillion of lower lip, C. If 1/3rd or less of lip is involved, Abbe-Estlander flap is used for reconstruction, D. Abbe-Estlander flap is based on superior labial aery
C: If 1/3rd or less of lip is involved, Abbe-Estlander flap is used for reconstruction
Answer: C: If 1/3rd or less of lip is involved, Abbe-Estlander flap is used for reconstruction 
Explanation: Carcinoma of lip: Non-healing ulcer or growth is the most common presentation Most common site is vermillion of lower lip - T1 & T2 - Surgery is TOC - IF 1/3rd or less of lip is involved: 'V' or 'W' shaped full thickness excision with lateral margin of 5 mm + primary closure. - If more than 1/3rd of lip is involved: Flap reconstruction (Abbe-Estlander flap) - T3 & T4 - Combined radiation & surgery (vermilionectomy )