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: Anatomy
Length of esophagus is ? 
Select and explain. 
A. 10 cm, B. 15 cm, C. 25 cm, D. 40 cm
C: 25 cm
Answer: C: 25 cm 
Explanation: Ans. is 'c' i.e., 25 cm Oesophagus 25cm longAerial supply:Cervical pa - Inferior thyroid aeryThoracic pa - Oesophageal branches of aoaAbdominal pa - Left gastric aeryVenous drainage:Cervical pa - Brachiocephalic veinsThoracic pa - Azygous veinsAbdominal pa - Left gastric veinLymphatic drainage:Cervical pa - Deep cervical nodesThoracic pa - Posterior mediastinal nodesAbdominal pa - Left gastric nodesNerve supply:Parasympathetic - Upper 1/2 - Recurrent laryngeal nerves Lower 1/2 - Oesophageal plexus (vagus)Sympathetic - Upper 1/2 - Fibres from middle cervical ganglion Lower 1/2 - Fibres from upper 4 thoracic ganglia Oesophagus shows 4 constrictions,At its beginning, 15cm from incisorsAoic arch - 22.5cm from incisorsLeft bronchus - 27.5cm from incisorsDiaphragm - 37.5cm from incisorsLower esophageal splincter is at diaphragmatic constriction.Oesophagus pierces the diaphragm at TIO level. Ends by opening into the bstomach at T11 level.