This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Anatomy
The predominant constituent of the pale yellow gallstones in the gallbladder is 
Select and explain. 
A. Mucin glycoprotein, B. Calcium carbonate, C. Cholesterol, D. Calcium phosphate
C: Cholesterol
Answer: C: Cholesterol 
Explanation: Cholesterol stones Cholesterol stones contain almost entirely cholesterol It is often solitary, pale yellow in colour Ref: Sabiston 20th edition Pgno :1492