Question: A 54-year-old patient with an alcoholic intake of 110 g / day, admitted due to chronic diarrhea and the appearance of muscle cramps in recent days. In the analytical one, glucose stands out 320 mg / dL, Urea 25 mg / dL, Creatinine 0.75 mg / dL, Potassium 2.5 mmol / L (3.5-5.1), Calcium 2.0 mmol / L (2 , 2-2.5), Phosphorus 0.52 mmol / L (0.87-1.55) Magnesium 0.25 mmol / L (0.66-0.99) and Albumin of 28 g / L (3552) With what would initiate the treatment? 
 Options:  <1> Insulin. <2> Potassium. <3> Calcium. <4> Match. <5> Magnesium.
5