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': 'Truss cannot prevent progression of which type of inguinal hernia - \nSelect and explain. \nA. Sliding, B. Littres, C. Indirect, D. Direct', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]