This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Blood Physiology, Subject name: Physiology
[{'content': 'Which of the following WBCs is impoant for "mucosal immunity"? \nSelect and explain. \nA. Lymphocytes, B. Neutrophils, C. Basophils, D. Eosinophils', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Large numbers of lymphocytes are present in the Mucosa of lungs, GI tract and urinary tract where they provide "mucosal immunity". They are weakly phagocytic.', 'role': 'assistant'}]