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: Pharmacology
[{'content': 'Inotropic receptor among the following is/are: \nSelect and explain. \nA. GABAa., B. Nm, C. Nn, D. All of the above.', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Other then these NMDA and 5-HT are also inotropic receptors.', 'role': 'assistant'}]