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: ENT
Features of laryngeal Ca: 
Select and explain. 
A. Glottis is the MC site, B. Commonly metastasizes to cervical lymph node, C. Lesions seen at the edge of the vocal cord, D. All
D: All
Answer: D: All 
Explanation: Larynx is divided into supraglottic, glottic and subglottic regions for the purpose of anatomical classification of carcinoma of larynx and is based on lymphatic drainage. The area above the vocal cords i.e. supraglottis drains upwards the superior lymphatics to upper deep cervical group of lymphnodes. Vocal cords, i:e glottis has practically no lymphatics. so, it acts as a watershed. The area below the glottis, (subglottis) drain to prelaryngeal and paratracheal glands and then to lower deep cervical nodes.