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': 'All the definitive signs of pregnancy except : \nSelect and explain. \nA. Amenorrhoea, B. Fetal movements, C. Fetal hea sounds, D. Fetal skeleton seen an X-ray', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Amenorrhoea', 'role': 'assistant'}]