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: Physiology
Mucin is secreted by? 
Select and explain. 
A. Skin, B. Lung, C. Stomach, D. Gall bladder
D: Gall bladder
Answer: D: Gall bladder 
Explanation: Gall bladderSecretion of Mucin:Secretes mucin adding to bile.During intestinal release of bile, mucin acts as lubricant. Aids in intestinal movement of chyme.