Which acupuncture point can be needled by pinching the skin with one hand and needling with the other hand?

The correct choice is based on the technique of needling while pinching the skin to help ensure that the needle goes in more easily and to minimize discomfort for the patient. BL-2 (zan zhu), located at the medial end of the eyebrow, is accessible for this technique. Pinching the skin creates a taut area that is easier to manipulate with the needle, resulting in more efficient needling at this specific point.

In contrast, the other points may not lend themselves as easily to this technique. For example, REN-4 (guan yuan) and ST-25 (tian shu) are deeper and require more precision, as they are not easily accessible for skin pinching due to their anatomical locations. REN-12 (zhong wan) also presents difficulties for this method due to its positioning on the abdomen which generally does not facilitate pinching in a practical manner while attempting to needle. Thus, the functionality of BL-2 for this technique makes it the most suitable choice.