This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diseases of Thyroid, Subject name: Medicine
Hypercalcemia is caused by? 
Select and explain. 
A. Adrenocoical insufficiency, B. Amyloidosis, C. Hypehyroidism, D. Vitamin C Intoxication
C: Hypehyroidism
Answer: C: Hypehyroidism 
Explanation: Hypehyroidism can result in increased bone turnover though the mechanism is not elucidated. Causes of hypercalcemia associated with high bone turnover Hypehyroidism Vitamin A intoxication Thiazides Immobilization