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".
Q: [header] How to take astragalus supplements [title] Take astragalus supplements for colds and seasonal allergies. [step] You can take astragalus supplements for colds and influenza, as it has anti-inflammatory and antibacterial properties. However, in some cases, astragalus supplements can make a cold worse. <sep> (A) For most people, though, the astragalus supplement works best. [substeps] The good news about astragalus supplements is that it is not toxic. (B) Use caution when taking astragalus supplements for colds. If your symptoms do not improve in a few days, you may want to switch to a different medication. (C) [substeps] If you suffer from " colds, " which is a seasonal occurrence and the flu symptoms to mention, do not take astragalus supplements. You should take this as a supplement for flu-like symptoms. (D) [title] Eat as much of astragalus as possible. [step] Astragalus also helps to disinfect the body from bacterial infections.
A:
B