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: Gynaecology & Obstetrics
[{'content': 'Actions of progesterone include all of the following except : \nSelect and explain. \nA. Increase the tone of cervical sphincter, B. Reduces the tone of uterine contractions, C. Sodium and water retention, D. Secretory hyperophy', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Reduces the tone of uterine contractions', 'role': 'assistant'}]