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: Unknown
A six-year-old child is admitted to the Paediatric ICU for seizures. He has been on treatment with Tacrolimus and Prednisolone. On investigations, his blood urea is 68 mg.dk Serum Sodium is 136 meq/l likely cause of his seizures - 
Select and explain. 
A. Uremia, B. Hyponatremia, C. Hypocalcemia, D. Tacrolimus Toxicity
D: Tacrolimus Toxicity
Answer: D: Tacrolimus Toxicity 
Explanation: Ans-D