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': 'In a solution the concentration of hydrogen ion (H+) is 1 x 10-6 moles/litre. The pH of the solution will be - \nSelect and explain. \nA. Three, B. Six, C. Nine, D. Twelve', 'role': 'user'}, {'content': 'Answer: B \nExplanation: pH is the negative log of the hydrogen ion concentration', 'role': 'assistant'}]