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': '1st step in developing film is \nSelect and explain. \nA. Stirring the solution, B. Washing of film, C. Dip in developer, D. Dip in fixer', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]