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: Surgery
[{'content': 'The most common complication seen in hiatus hernia is \nSelect and explain. \nA. Esophagitis, B. Aspiration pneumonitis, C. Volvulus, D. Esophageal stricture', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e. Esophagitis There are 4 types of hiatal herniaType I : Sliding hernia (most common type -- 70 - 80%)Type II : Paraesophageal or rolling herniaType III : MixedType IV : these hernias are distinguished by the presence of other abdominal viscera wihin the defect i.e. omentum, transverse colon.Type I or Sliding hiatal hernia- this is characterized by upward dislocation of the cardioesophageal junction into the posterior mediastinum.Type II or Rolling Paraesophageal hernia- the cardioesophageal junction is undisplaced the whole or pa of stomach herniates into the thorax immediately adjacent and to the left of the undisplaced cardioesophageal junction.- since the normally located gastroesophageal junction functions normally in most of these hernias, reflux is uncommon", 'role': 'assistant'}]