This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
Tall T wave in E.C.G occurs in - 
Select and explain. 
A. Hyperkalemia, B. Hypokalemia, C. Hypercalcemia, D. Hypocalcemia
A: Hyperkalemia
Answer: A: Hyperkalemia 
Explanation: Tall T waves are a feature of hyperkalemia ref Harrison 20th edition pg 1554