This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Digestion and Absorption, Subject name: Physiology
[{'content': 'Vitamin B12 is mainly absorbed from? \nSelect and explain. \nA. Duodenum, B. Jejunum, C. Ileum, D. Colon', 'role': 'user'}, {'content': 'Answer: C \nExplanation: ANSWER: (C) IleumREF: Ganong, 22nd edition, p471Bile salts and vitamin B12 are mainly absorbed by ileumIron and vitamins (other than B12) are absorbed mainly from proximal small intestine (duodenum and jejunum)Maximum fat absorption- JejunumLong chain fatty acid absorption- Duodenum+ JejunumShort chain fatty acid- Colon', 'role': 'assistant'}]