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': 'Optical transmission through a solution depends on: \nSelect and explain. \nA. Time, B. Concentration, C. Scale, D. None', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Concentration', 'role': 'assistant'}]