How is GB-15 classified in terms of meridian meeting?

GB-15, also known as "Head's Door," is classified as a point where the Gallbladder (GB) meridian, the Bladder (BL) meridian, and the Yang Wei (Yang Linking) vessel meet. This classification emphasizes its role in connecting and balancing the functions of these channels.

The significance of GB-15 lies in its location on the head, where it can influence both local and systemic conditions. By understanding the meeting of these meridians, practitioners can effectively utilize GB-15 in treating issues that may involve both the urinary system (associated with the Bladder) and the digestive or gallbladder functions, as well as conditions affected by the Yang Wei vessel, which is associated with the exterior and defense mechanisms of the body.

In this case, the other choices do not accurately represent the meridian meeting associated with GB-15, either by referencing incorrect combinations of meridians or failing to include the crucial Yang Wei aspect of its classification. Recognizing the importance of these meridian interactions is vital for practitioners in effectively applying acupuncture techniques.