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
Which of the following is not associated with hypercalcemia? 
Select and explain. 
A. Tumor lysis syndrome, B. Hyperparathyroidsm, C. Multiple sclerosis, D. Sarcoidosis
A: Tumor lysis syndrome
Answer: A: Tumor lysis syndrome 
Explanation: This is a question repeated often. Tumor lysis syndrome causes hypocalcemia. A normal serum calcium level is 8-10 mg/dL (2-2.5 mmol/L) with some interlaboratory variation in the reference range, and hypercalcemia is defined as a serum calcium level greater than 10.5 mg/dL (>2.5 mmol/L).