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: Surgery
A patient on total parenteral nutrition for 20 days presents with weakness, veigo and convulsions. Diagnosis is: 
Select and explain. 
A. Hypomagnesemia, B. Hyperammonemia, C. Hypercalcemia, D. Hyperkalemia
A: Hypomagnesemia
Answer: A: Hypomagnesemia 
Explanation: Ans. is 'a' i.e., Hypomagnesemia All the above given metabolic abnormalities except hyperammonemia is seen in TPN, however the symptoms mentioned match with those of hypomagnesemia.