Which point is designated as the source point for the Yin Qiao Mai channel?

KI-6, also known as Zhaohai, is designated as the source point for the Yin Qiao Mai channel. In Traditional Chinese Medicine (TCM), source points are significant because they are believed to connect to the organ's essence and are essential for regulating the related channel's energy, or qi.

The Yin Qiao Mai, or Yin Heel Vessel, is closely involved in functions related to sleep and the regulation of the body's yin energy, particularly concerning the kidney and reproductive systems. KI-6 provides access to the lower yin, which is essential for nourishing the body and balancing its energies. This point is often used in clinical practice to treat conditions like insomnia or disorders related to yin deficiency, reinforcing its role as the source point for the Yin Qiao Mai.

Other options, while relevant to their respective channels or organ systems, do not fulfill the specific designation of being the source point for the Yin Qiao Mai. KI-16, SP-3, and BL-23 have their specific indications and are valuable in TCM therapies, but they do not share the same relationship with the Yin Qiao Mai as KI-6 does. Thus, KI-6 stands out as the correct answer for this question.