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
A diet deficient in calcium will result in: 
Select and explain. 
A. 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
D: Production of parathyroid hormone and bone resorption
Answer: D: Production of parathyroid hormone and bone resorption 
Explanation: None