This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
usually gall stones consists of these types expect 
Select and explain. 
A. Oxalates, B. Bile salts, C. Bile pigments, D. Cholesterol
A: Oxalates
Answer: A: Oxalates 
Explanation: There are two general Clsses of hailstones :cholesterol stones containing more than 50 percbt6of crystalline cholesterol monohydrate and pigmrny6stones composed predominantly of bilirubin calcium salts