This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vitamins, Subject name: Biochemistry
Which of the following is not required for healing - 
Select and explain. 
A. Vitamin C, B. Copper, C. Methionine, D. Sodium
D: Sodium
Answer: D: Sodium 
Explanation: Ans. is 'd' i.e., Sodium o Nutrient required for proper wound healing areA) Minerals: Iron (divalent iron), Manganese, Magnesium, copper, calcium, zinc.B) Vitamins: Ascorbic acid (vitamin C), Retinol (vitamin A), and less importantly riboflavin, pyridoxin, thiamine, tocopherol (vitamin E).C) Protein and amino acids : Methionine and cysteine are most important.