This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
[{'content': 'A diet deficient in calcium will result in: \nSelect and explain. \nA. Stimulation of the thyroid gland, B. Increased ability to cross-link fibrin, C. Production of Calcitonin and a Low blood calcium level, D. Production of parathyroid hormone and bone resorption', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]