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
Regarding oxytocin, true statements are: 
Select and explain. 
A. Acts on myoepithelial cells of breast, B. Causes contraction of uterus during labour, C. May cause retention of water, D. All of these
D: All of these
Answer: D: All of these 
Explanation: None