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: Orthopaedics
A 50-year-old man presented with multiple pathological fractures. His serum calcium was 11.5 mg/dl and phosphate was 2.5 mg/dl. Alkaline phosphatase was 940 I.U./dl. The most probable diagnosis is - 
Select and explain. 
A. Osteoporosis, B. Osteomalacia, C. Multiple myeloma, D. Hyperparathyroidism
D: Hyperparathyroidism
Answer: D: Hyperparathyroidism 
Explanation: Multiple pathological fractures, high calcium, low phosphate and high alkaline phosphatase suggest the diagnosis of hyperparathyroidism.