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
Features of tumor lysis syndrome are: 
Select and explain. 
A. Hypocalcemia, B. Hypophosphatemia, C. Alkalosis, D. Hypokalemia
A: Hypocalcemia
Answer: A: Hypocalcemia 
Explanation: Answer is A (Hypocalcemia): Tumor Lysis syndrome is associated with Hypocalcemia. Tumor Lysis Syndrome is also associated with Hyperphosphatemia, Hyperkalemia and Acidosis.