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': 'Lysozyme is present in all secretions except: \nSelect and explain. \nA. Sweat, B. Egg, C. Tears, D. Saliva', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Lysozyme is present in tears, egg, saliva and nearly in all secretions except in CSF, sweat and urine.', 'role': 'assistant'}]