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': 'Receptors that are stimulated by a change in the chemical composition of the environment are: \nSelect and explain. \nA. Mechanoreceptors, B. Chemoreceptors, C. Nocireceptors, D. None of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Chemoreceptors are those receptors that are stimulated by a change in the chemical composition of the environment. They include receptors for taste and smell and visceral receptors that are sensitive to change in plasma O2, pH and osmolality.', 'role': 'assistant'}]