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': 'Regarding oxytocin, true statements are: \nSelect and explain. \nA. Acts on myoepithelial cells of breast, B. Causes contraction of uterus during labour, C. May cause retention of water, D. All of these', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]