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
[{'content': 'Features of laryngeal Ca -a) Glottis is the MC siteb) Commonly metastasizes to cervical lymphnodec) Lesions seen at the edge of the vocal cordd) Laryngeal compartments acts as barrier \nSelect and explain. \nA. abc, B. acd, C. bcd, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: As discussed previously, larynx is divided into supraglottic, glottic and subglottic regions for the purpose of anatomical classification of carcinoma of larynx.\nIt is an important division and is based on lymphatic drainage.\nThe area above the vocal cords i.e. supraglottis drains upwards via the superior lymphatics to upper deep cervical group of lymphnodes.\nVocal cords, i:e glottis has practically no lymphatics so, it acts as a watershed.\nThe area below the glottis, (subglottis) drain to prelaryngeal and paratracheal glands and then to lower deep cervical nodes.\n\nHence option b and d are both correct', 'role': 'assistant'}]