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': 'True about Trichobezors except - \nSelect and explain. \nA. It is caused by Trichuris, B. It is a psychatric manifestation, C. Ball of hairs in the stomach, D. Pulling the hair & sucking of hair is usually seen', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]