This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General physiology, Subject name: Physiology
[{'content': 'Which of the following techniques is used to study the current flow across a single ion channel? \nSelect and explain. \nA. Voltage clamp technique, B. Patch clamp technique, C. Iontophoresis, D. Galvanometry', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Patch clamp technique is a laboratory technique in electrophysiology used to study ionic currents in individual isolated living cells,tissue sections or patches of cells Ref:Guyton and Hall textbook of medical physiology 12th edition,page number:66,67,68', 'role': 'assistant'}]