Detailed Instructions: In this task, you are given a context and four options. Each option is a suggested ending for the context. You should read the context and pick the best ending for the context. Please answer with "A", "B", "C", and "D".
Q: [header] How to dissolve gallstones [title] Consider oral dissolution therapy. [step] Your doctor may prescribe a course of ursodiol to dissolve your gallstones without surgery. These treatments are essentially bile acids in pill form. <sep> (A) Ursodiol, in particular, is a popular treatment because it is one of the safest common drugs available. [substeps] Oral dissolution therapy is most likely to be successful in treating small stones (less than 1.5 centimeters in diameter) with high cholesterol content. (B) [substeps] Optionally, your doctor may administer another course of pills to dissolve your gallstones. [title] Apply falafel or relenium for oral use. (C) They usually involves dissolving one set of gallstones in 1 liter (3 gal) of water. Your doctor may prescribe : [substeps] Intravenous (or uropausal) water with benzoyl peroxide. (D) [substeps] The medication is injected into the gallstones and completely dissolved within three to five days. For opioids, these forms of dissolution may be prescribed.
A:
A