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: Surgery
Which of the following drug is used for medical treatment of gall stones 
Select and explain. 
A. Clemastine fumarate, B. Mizolastine, C. Lovastatin, D. Ursodeoxycholic acid
D: Ursodeoxycholic acid
Answer: D: Ursodeoxycholic acid 
Explanation: Dissolution therapy for asymptomatic cholestrol stones can be done with ursodeoxycholic acid,which is a bile acid that dissolves cholesterol.