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: Dental
[{'content': 'Which of the following cells are predominant in the \nstage 1 of gingivitis are \nSelect and explain. \nA. Plasma cells, B. Neutrophils, C. Mast cells, D. Lymphocytes', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]