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 cause of shock of children is \nSelect and explain. \nA. Hypovolemic shock, B. Cardiogenic shock, C. Septic shock, D. Neurogenic shock', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Hypovolemic shock is the most common cause of shock in children and adults.', 'role': 'assistant'}]