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': 'In a blast injury , which of the following organ is least vulnerable to the blast wave \nSelect and explain. \nA. G .I tract, B. Lungs, C. Liver, D. Ear drum', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]