This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Electrolyte Imbalance, Subject name: Medicine
Pseudo-hypokalemia occurs due to? 
Select and explain. 
A. Leukemia, B. Leucopenia, C. Inappropriate fist clenching/tight compression of muscles prior to sampling, D. Use of a thin bore needle during sampling
A: Leukemia
Answer: A: Leukemia 
Explanation: In Leukemia there is In vitro shift of K+into cells and if sample is kept for long outside and it may show Pseudo-hypokalemia. Pseudo K??" Leukemia Pseudo K??' Thin bore needle, Excessive clenching of the fist, Hemolysis Pseudo Na??" Lipids??' , Multiple myeloma