Which section of the pancreas lies against the spleen?

The correct choice is the tail of the pancreas, as it is located at the left side of the organ and lies in close proximity to the spleen. The anatomy of the pancreas is such that it has several distinct parts: the head, neck, body, and tail. The tail is the most lateral aspect of the pancreas and extends toward the hilum of the spleen, making it the part of the pancreas that is anatomically adjacent to the spleen.

Understanding the relationships between these organs is important for both surgical considerations and diagnostic imaging. The head of the pancreas is situated near the duodenum, while the neck and body are oriented more towards the midline and right side of the abdomen. The interaction with other surrounding structures can help clarify the location of the tail, which is distinctly positioned near the spleen.