Given the task definition, example input & output, solve the new input case.
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". 
Example: [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.
Output: D
This is a good example. Only option D is about Christmas trees. So, it's the correct option.

New input case for you: [header] How to microchip your cat [title] Avoid microchipping your cat on your own. [step] Never inject your cat with a microchip on your own. This is illegal in many states and can cause you to have legal measures taken against you. <sep> (A) [title] Take your cat to a vet if your cat appears or acts strange while you are microchipping. [step] A vet can rule out anything relating to your cat's sensitivity. (B) [substeps] There are sellers who will sell you a microchip without going through a veterinary office, but you should never implant these devices yourself. Take these to your vet to have them checked out and implanted in the right way. (C) Try to avoid doing so on your own as well. People who come in contact with this type of pet are generally not able to microchip their cats. (D) Keeping your cat indoors with the chip is also illegal, as is using an epipen or prescription medicine. [substeps] Skip this part and put the microchip into an epipen.
Output:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
B