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': "Signs positive in early pregnancy are : \nSelect and explain. \nA. Hegar's sign, B. Palmer's sign, C. Goodell's sign and Osiander's sign both, D. All", 'role': 'user'}, {'content': 'Answer: D \nExplanation: All', 'role': 'assistant'}]