This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gastrointestinal System, Subject name: Physiology
[{'content': 'True statement about Ca++ absorption from intestines is:- \nSelect and explain. \nA. Major absorption occurs in the ileum, B. It occurs mainly the para cellular pathway, C. It occurs by active transpo, D. It is facilitated by phosphates in diet', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Calcium ions are actively absorbed into the blood, especially from the duodenum, and the amount of Ca++ ion absorption is exactly controlled to supply the daily need of the body for calcium. One impoant factor controlling Ca++ absorption : Parathyroid hormone Vitamin - D. PTH - (+) vitamin D (PTH activates vitamin D, & the activated vitamin D in turn greatly enhances Ca++ absorption).', 'role': 'assistant'}]