This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General obstetrics, Subject name: Anatomy
[{'content': 'Primigravida with full term, complains of faintness on lying down and she feels well when turns to side or sitting position. This is due to \nSelect and explain. \nA. Increased intraabdominal pressure, B. IVC compression, C. Increased intracranial pressure, D. After heavy lunch', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Supine hypotension syndrome : During late pregnancy,the gravid uterus produces a compression effect on the IVC when patient is in supine position . In 90% cases, this results in opening up of the collateral circulation by means of paraveebral and azygos veins. In 10 % cases, when collaterals fails to open up, the venous rReturn Ofthe hea may be seriously cuailed. This results in production of hypotension, tachycardia and syncope -Supine Hypotension Syndrome. The normal blood pressure is quickly restored by turning the patient to lateral position. Ref:Datta Obs 9e pg 49.', 'role': 'assistant'}]