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
[{'content': 'Which of the following micronutients have a role in regulation of binding of proteins to DNA? \nSelect and explain. \nA. Zinc, B. Copper, C. Selenium, D. Nickel', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Protein-DNA interactions are regulated by several motifs which includes Helix turn-Helix motif, Zinc finger motif and Leucine Zipper motif.', 'role': 'assistant'}]