You will be given a definition of a task first, then some input 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 dry out a pimple [title] Ask your doctor about retinoid treatments. [step] Topical retinoids are gels or creams that you apply to your face as an acne treatment. They are an effective treatment for reducing acne. <sep> (A) These medications require a prescription from your doctor or dermatologist. [substeps] You will need to apply the medicine three times per week at first and then work up to applying it once per day as your skin adjusts to it. (B) [substeps] You do not need to reuse a prescription retinoid. If your pimple is severe enough to warrant medical treatment, the doctor may advise blocking pores that provide deeper or more serious damage to the acne. (C) With the residue of acne treated, the pimple may disappear on its own. [substeps] Retinoids can be applied twice a day for 2-4 weeks, twice a week for up to 6 weeks, or more if the pimple stays there for longer than a day. (D) They are usually applied to your pimple twice a day, once in the morning and once in the night. When your doctor is treating you, they will inject the retinoids into the dermis which is where you see the blemishes.
Output:
A