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': 'Which of the following actions is ascribed to delta type of opioid receptors ? \nSelect and explain. \nA. Supraspinal analgesia, B. Respiratory depression, C. Euphoria, D. Reduced intestinal motility', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]