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
[{'content': 'The predominant constituent of the pale yellow gallstones in the gallbladder is \nSelect and explain. \nA. Mucin glycoprotein, B. Calcium carbonate, C. Cholesterol, D. Calcium phosphate', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Cholesterol stones Cholesterol stones contain almost entirely cholesterol It is often solitary, pale yellow in colour Ref: Sabiston 20th edition Pgno :1492', 'role': 'assistant'}]