This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epilepsy and EEG, Subject name: Medicine
Which is the most common electrolyte abnormality causing seizures in hospitalized patients? 
Select and explain. 
A. Hyponatremia, B. Hypernatremia, C. Hypokalemia, D. Hyperkalemia
A: Hyponatremia
Answer: A: Hyponatremia 
Explanation: Hyponatremia is MC electrolyte abnormality in hospitalized patients and values <120 mEq/dl lead to cerebral edema and resultant seizures. Plasma Na+ concentration <135 mM, is a very common disorder, occurring in up to 22% of hospitalized patients. This disorder is almost always the result of an increase in circulating AVP and/or increased renal sensitivity to AVP, combined with an intake of free water; a notable exception is a hyponatremia due to the low solute intake.