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: Physiology
[{'content': 'Rheobase indicates: \nSelect and explain. \nA. Magnitude of current, B. Rate of discharge, C. Velocity of nerve conduction, D. Specificity of impulse transmission', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Rheobase:\xa0The\xa0minimum\xa0strength\xa0or\xa0magnitude of a stimulus, which is able to produce AP in\xa0an\xa0excitable\xa0tissue (e.g.\xa0Nerve,muscle)\xa0regardless of the duration it takes.', 'role': 'assistant'}]