This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lacrimal Apparatus and Eyelid Disorders, Subject name: Ophthalmology
[{'content': 'Lysozyme and lactoferrin are present in which layer of tear film:- \nSelect and explain. \nA. Mucous layer, B. Aqueous layer, C. Lipid layer, D. All the layers', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Lysozyme and lactiferrin are present in aqueous layer Aqueous layer Produced - 95% by main lacrimal gland 5% by accessory lacrimal gland of Krause and Wolfring Average aqueous tear flow - 1.2 ml /min Normal thickness - 7 mm Composition: -Water 98% -Lysozyme -Tear specific prealbumin -Immunoglobulin A -Other proteins(lactoferrin) Function: -Hydration -Lubrication -Antimicrobial action -Oxygenation -Mechanical debris removal', 'role': 'assistant'}]