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: Gynaecology & Obstetrics
[{'content': 'True statement regarding ectopic pregnancy: \nSelect and explain. \nA. Serum progesterone >25 ng/ml exclude ectopic, B. p-hCG levels should be >1000 mlU/ml for earliest detection by TVS, C. p-hCG levels should be <1000 mlU/ml for earliest detection by TVS, D. Methotrexate is not used for treatment', 'role': 'user'}, {'content': 'Answer: A \nExplanation: If the serum beta hcg value is 1500 IU/L and an intrauterine pregnancy is not visualized in a TVS it is likely to be an ectopic .This is the level at which intrauterine gestational sac is seen and is called discriminatory zone (refer pgno:159 sheila 2 nd edition)', 'role': 'assistant'}]