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
Lysozyme is present in all secretions except: 
Select and explain. 
A. Sweat, B. Egg, C. Tears, D. Saliva
A: Sweat
Answer: A: Sweat 
Explanation: Lysozyme is present in tears, egg, saliva and nearly in all secretions except in CSF, sweat and urine.