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': 'Base Stacking of DNA is characterised by \nSelect and explain. \nA. Electrophoresis, B. Hyperchromicity, C. Linear dichromicity, D. Hypochromicity', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]