This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology, Subject name: Microbiology
Lysozyme is present in the following secretions of the body except: 
Select and explain. 
A. Lacrimal secretions, B. CSF, C. Saliva, D. Respiratory tract secretions
B: CSF
Answer: B: CSF 
Explanation: Ans. is 'b' i.e., CSF(Ref: Ananthanarayan, 9th/e, p. 80 and 8th/e, p. 85)* Lysozyme is present in all secretions except CSF, sweat and urine.