The last section of the small intestine before it connects to the large intestine is the ileum. Here's a brief explanation:
1. The small intestine is divided into three parts: the duodenum, jejunum, and ileum.
2. The duodenum is the first part of the small intestine where most of the digestion takes place.
3. The jejunum is the middle section of the small intestine responsible for further absorption of nutrients.
4. The ileum is the final section of the small intestine before it connects to the large intestine.
5. It plays a crucial role in absorbing nutrients, especially vitamin B12 and bile salts.
Therefore, in the given options, the correct answer is O ileum.
