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': 'Which of the following is not present in lungs? \nSelect and explain. \nA. Clara cells, B. Langerhans cells, C. Brush cells, D. Klutischky cells', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]