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".
One example is below.
Q: [header] How to create a christmas tree forest [title] Consider the type of tree you want to plant. [step] There are a wide variety of christmas trees and include fir, pine, spruce, cypress, and cedar. These trees thrive in different climates and look different from one another. <sep> (A) It is important to research the tree before setting up your tree to try it out to make sure you can write the tree's growing season so that you can get the most supplies you need. If you're just interested in having a tree stand out, then make sure to check for the following : [substeps] Spruce trees. (B) [substeps] Trees green may be used in a mix of green and evergreen. Greens, such as pintos and olive oil, may be more delicate than these. (C) Where the trees grow together is up to you. [substeps] Spruce trees light up the night for hours in the morning and drown out the morning sunrise between afternoons. (D) Think about where your tree forest will be located and choose a tree that can thrive in that climate. [substeps] Balsam firs are a popular christmas tree species that grow in the northern united states and canada, in hardiness zones 3-5 or states like minnesota, north dakota, and montana.
A: D
Rationale: This is a good example. Only option D is about Christmas trees. So, it's the correct option.
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