What results from obstruction of the duodenum in the case of an annular pancreas?

The correct choice indicating that obstruction of the duodenum due to an annular pancreas results in malabsorption is grounded in the anatomical and physiological implications of this condition. An annular pancreas is characterized by a ring of pancreatic tissue encircling the duodenum, which can constrict or obstruct the passage of digested food.

When the duodenum is obstructed, it impedes the normal flow of chyme, which is necessary for the digestion and absorption of nutrients. The duodenum is the initial segment of the small intestine and plays a vital role in the absorption of carbohydrates, fats, and proteins, as well as in the neutralization of stomach acid and the further digestion of food through enzymatic action. As a result of this obstruction, nutrients are not effectively absorbed into the bloodstream, leading to malabsorption.

While other options might reflect complications related to gastrointestinal issues or conditions, they do not directly result from the obstruction caused by an annular pancreas in the same manner or to the same extent as malabsorption. Hence, the impact on nutrient absorption in the presence of a duodenal obstruction is key to understanding the consequences of this anomaly.