What acupoint should be used for ST deficiency with cold stagnation in cases of epigastric pain?

The appropriate acupoint for ST deficiency with cold stagnation leading to epigastric pain is the point located on the Back Shu of the Spleen, which is indicated for supporting the Spleen's function and addressing deficiencies associated with cold stagnation.

This specific acupoint is linked to enhancing the Spleen's ability to transform and transport, which is crucial in scenarios where there is a deficiency in the Spleen combined with cold. Cold stagnation can impede the normal functioning of the digestive system, leading to symptoms such as epigastric pain. By using this point, practitioners can help restore balance to the Spleen's energy from deficiency while also alleviating the sensation of cold.

Conversely, other acupoints in the given options are related to different functions that may not directly address the combination of ST deficiency and cold stagnation. While each of the other points serves specific purposes, they do not match the clinical focus required for this particular presentation of symptoms. Therefore, the selection of the Spleen Back Shu point directly addresses both the deficiency and the stagnation, making it the most suitable choice for treating the described condition.