A hospitalised patient who has been maintained on parenteral

A hospitalised patient who has been maintained on parenteral alimentation for 3 weeks, develops weakness, tremors, agitation, and finally coma. The most likely fluid and electrolyte disturbance is:

1- hyperkalemia.
2- dehydration.
3- hypomagnesemia.
4- acidosis.
5- hype rcalcemia

3- hypomagnesemia