This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Esophageal disorders, Subject name: Pathology
[{'content': 'All of the following statement are true regarding esophageal atresia, except: \nSelect and explain. \nA. There is absence of esophagus, B. It is a mechanical obstruction, C. It occurs most commonly at or near the tracheal bifurcation, D. It is associated with other congenital anomalies', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Esophageal atresia Congenital defect Thin, non-canalized cord replaces a segment of esophagus, causing a mechanical obstruction. Thus, some pa of esophagus is present in esophageal atresia - option-1 is wrong. Commonly at/near tracheal bifurcation usually associated with fistula connecting upper/lower esophageal pouches to bronchus or trachea. Abnormalities of the esophagus are associated with congenital hea defects, genitourinary malformations, and neurologic disease.', 'role': 'assistant'}]