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
In a solution the concentration of hydrogen ion (H+) is 1 x 10-6 moles/litre. The pH of the solution will be - 
Select and explain. 
A. Three, B. Six, C. Nine, D. Twelve
B: Six
Answer: B: Six 
Explanation: pH is the negative log of the hydrogen ion concentration