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: Biochemistry
Which of the following micronutients have a role in regulation of binding of proteins to DNA? 
Select and explain. 
A. Zinc, B. Copper, C. Selenium, D. Nickel
A: Zinc
Answer: A: Zinc 
Explanation: Protein-DNA interactions are regulated by several motifs which includes Helix turn-Helix motif, Zinc finger motif and Leucine Zipper motif.