system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Calcium absorption is from:
assistant
The correct answer is  Ans. (a) Proximal small intestine(Ref: Ganong, 25th ed/p.375)Active calcium absorption occurs mainly in the proximal small bowel (duodenum and proximal jejunum)