This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Breasts and Lactation, Subject name: Gynaecology & Obstetrics
[{'content': 'Oxytocin will not do the following action \nSelect and explain. \nA. Milk production, B. Milk let down, C. Contraction of myo-epithelial cells, D. Vascular contraction', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Milk productionRef : D.C. Dutta 8th ed. /136, 574Milk production is by Prolactin.', 'role': 'assistant'}]