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: Radiology
[{'content': 'The first CT scan was manufactured by: \nSelect and explain. \nA. Hitachi, Japan, B. Mitsubishi, Japan, C. Electromusical instruments, England, D. General Electric, USA', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. Electromusical instruments, England', 'role': 'assistant'}]