This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Stomach & Duodenum, Subject name: Surgery
[{'content': 'A 65-year-old man was admitted to the hospital for severe bilious vomiting following gastric surgery. This occurs in which circumstance? \nSelect and explain. \nA. Following ingestion of gaseous fluids, B. Spontaneously, C. Following ingestion of fatty foods, D. Following ingestion of bulky meals', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Bilious vomiting is usually spontaneous and should be differentiated from vomiting that occurs after eating. The most likely cause of this complication is reflex of bile into the stomach. Bile gastritis with industrialization of the gastric mucosa is a likely cause.', 'role': 'assistant'}]