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: Surgery
A known patient with renal stone disease developed pathological fracture along with abdominal pain and certain psychiatric symptoms.
He should be investigated for 
Select and explain. 
A. Polycystic kidney, B. Renal tubular acidosis, C. Hyperparathyroidism, D. Paget's disease of bone
C: Hyperparathyroidism
Answer: C: Hyperparathyroidism 
Explanation: None