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 of heart disease in pregnancy:a) Diastolic murmurb) Systolic murmurc) Tachycardiad) Dyspnea on exertione) Nervousness or syncope on exertion \nSelect and explain. \nA. acd, B. ade, C. abd, D. ad', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]