You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
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".

[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.
Solution: D
Why? This is a good example. Only option D is about Christmas trees. So, it's the correct option.

New input: [header] How to take alpha lipoic acid [title] Ask if ala is a good choice for you. [step] Before starting any supplement, you should always consult your doctor first, as supplements can have side effects and interactions. For instance, ala can lower your blood sugar levels, which can be dangerous if you're diabetic. <sep> (A) [substeps] Some doctors are not experts in how supplements interact with regular medications. If yours isn't, consider visiting a doctor who also specializes in alternative medications. (B) [substeps] Similarly, ala may make your genital area feel hot and uncomfortable. Overuse of the supplement can also cause bleeding, swelling, and an associated rash. (C) [substeps] If you're prescribed ala for diabetic treatment, ask your doctor before taking ala. Ala can interact negatively with other medication if you don't have more than 2 times normal doses of ala on your daily medication or through any supplement you're taking. (D) Ala should be avoided until you first start to take it for its effect on your thyroid. [substeps] In some studies, ala users report lower blood sugar levels for, say , 45 to 60 mg most days.
Solution:
A