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The ascending colostomy is indeed most likely to produce liquid stool. This type of colostomy is performed on the right side of the abdomen and involves the ascending colon, which is responsible for the initial absorption of water from the waste material. Since the contents in the ascending colon have not undergone significant water absorption, the stool tends to be more liquid in nature.

In contrast, other colostomy types are associated with progressively more solid stool as the digested material moves through the colon. The transverse colostomy typically produces a more pasty consistency because it is located further along the digestive tract, where some water absorption has already occurred. The descending and sigmoid colostomies, located even further along, usually produce more solid stool due to more extensive water reabsorption and the nature of fecal formation from the colon's function. This is why the ascending colostomy is noted for yielding liquid stool, distinguishing it from the other types.