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: Pathology
[{'content': 'Gray hepatization of lungs is seen on day: \nSelect and explain. \nA. 1, B. 3-Feb, C. 5-Mar, D. 7-May', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 5-Mar', 'role': 'assistant'}]