Which organ is affiliated with BL-42?

The correct choice is affiliated with the Po, which represents the corporeal soul in Traditional Chinese Medicine. BL-42, also known as "Po Hu" or "Back of the Lung," is the back shu point associated with the lung organ. In TCM, the lung governs Qi and is closely connected to the Po, which is thought to reside in the lungs and relates to physical sensations and the body’s connection to the physical world.

BL-42’s role in acupuncture involves addressing issues related to the lung, such as breathing difficulties or emotional disturbances linked to grief and sadness, which are often associated with the Po. Understanding this connection aids practitioners in treating conditions that may arise from imbalances in the lung function and its corresponding spiritual aspects.

The other options, while they represent different aspects of spirit and function according to TCM—such as the Hun related to the ethereal soul, the Yi corresponding to the intellect, and the Zhi associated with willpower—do not correlate as closely with BL-42, which specifically pertains to the lung and the corporeal aspect of the soul. Thus, the Po is the most relevant organ affiliated with this point.