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: Medicine
Increased Calcium with Decreased Phosphate levels are seen in: 
Select and explain. 
A. Primary hyperparathyroidism, B. Secondary hyperparathyroidism due to Vitamin D deficiency, C. Malignancy with lytic bone lesions, D. Osteoporosis
A: Primary hyperparathyroidism
Answer: A: Primary hyperparathyroidism 
Explanation: Answer is A (Primary Hyperparathyroidism): Serum Calcium with Decreased Serum Phosphate levels are typical of Primary Hyperparathyroidism