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': 'True statements about DNA structure: \nSelect and explain. \nA. All nucleotides are involved in linkage, B. Antiparallel, C. Bases are perpendicular to DNA, D. All', 'role': 'user'}, {'content': 'Answer: D \nExplanation: A i.e. All nucleotides are involved in linkage; B i.e. Antiparallel; C i.e. Bases perpendicular to DNA', 'role': 'assistant'}]