This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Obstetrics, Subject name: Gynaecology & Obstetrics
[{'content': 'In which of the following conditions a medical treatment of ectopic pregnancy contraindicated? \nSelect and explain. \nA. Sac size is 3 cm, B. 50 mL free fluid in pelvis, C. Presence of foetal hea activity, D. Previous ectopic pregnancy', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Medical management (methotrexate) is the treatment of choice for an ectopic pregnancy whenever the required criteria are fulfilled- Patient should be hemodynamically stable (unruptured tubal ectopic pregnancy). Foetal cardiac activity absent (presence of cardiac activity is a relative contraindication). b-hCG levels <5,000 mIU/mL (levels > 5,000 micro IU/mL is a relative contraindication). Gestational sac diameter <4 cm. Free fluid in POD <100 mL.', 'role': 'assistant'}]