This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Facial Injuries and Abnormalities, Subject name: Surgery
All of the following are indication for adjuvant radiotherapy in head neck cancers except:- 
Select and explain. 
A. Multiple lymph node disease, B. Extranodal involvement, C. Lymphovascular invasion, D. Lymph node >3cm
D: Lymph node >3cm
Answer: D: Lymph node >3cm 
Explanation: Lymph node >3cm is not an indication for adjuvant radiotherapy in head neck cancers. Indications for postoperative include:- -positive margins -invasion of the soft tissues of the neck -extranodal involvement - perineural invasion, and -more than 5 mm of subglottic invasion.