This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Obs), Subject name: Gynaecology & Obstetrics
[{'content': 'Breathing movement of fetus on USG is first detected on? \nSelect and explain. \nA. 11 weeks, B. 20 weeks, C. 24 weeks, D. 26 weeks', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A. 11 weeksDutta states: "Breathing movements are identified by 11 weeks but are irregular until 20th week. Their frequency varies from 30-70 per minute and is dependent on the maternal blood sugar concentration."', 'role': 'assistant'}]