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 reduce tsh levels [title] Have your tsh levels tested. [step] The most reliable way to lower your tsh levels due to hypothyroidism is to take a synthetic thyroid hormone called levothyroxine. This drug is available by prescription from your doctor. <sep> (A) However, if you don't get any response from your doctor, try some probiotic supplements to avoid tsh sensitivity. [substeps] Popular probiotic supplements include: arbyl-sate (mipee), coenzyme (phytococcus), and piros (vators). (B) If you're having difficulties regulating your tsh levels, it may be useful to take other forms of thyroid hormone. [substeps] You should check your doctor's approval to administer levothyroxine. (C) [substeps] Be sure that you talk to your doctor about taking this drug in children younger than nine years old. Levothyroxine can be taken as candy or consumed as a tablet. (D) It is an oral medication that restores your hormone levels and reverses the symptoms of hypothyroidism. You will need to take it once a day.
D