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': 'An index of the binding affinity of a hormone for its receptor can be obtained by examining the \nSelect and explain. \nA. Y-intercept of a Scatchard plot, B. Slope of a Scatchard plot, C. Maximum point on a biological dose-response curve, D. X-intercept of a Scatchard plot', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Scatchard plots of hormone-receptor binding data give information regarding the number of receptors and the affinity of the hormone for its receptor. The x-intercept provides data regarding total receptor number, and the slope is equal to the negative of the association constant (-Ka).', 'role': 'assistant'}]