This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Medicine
Which of the following most strongly suggests the diagnosis of primary hyperparathyrodism? 
Select and explain. 
A. Serum acid phosphatase above 120IU/L, B. Serum calcium above 11 mg/dL, C. Urinary calcium below 100 mg/day, D. Serum alkaline phosphatase abve 120 lU/L
B: Serum calcium above 11 mg/dL
Answer: B: Serum calcium above 11 mg/dL 
Explanation: Diagnostic criteria for primary hyperparathyroidism and its surgery Ref - semantischolar.org