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': 'What is the treatment of choice of unruptured tubal pregnancy with serum p-hCG titre 2000 lU/ml \nSelect and explain. \nA. Single dose of methotrexate, B. Variable dose of methotrexate, C. Expectant management, D. Laparoscopic salpingostomy', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Multiple dose methotrexate very effective for an unruptured ectopic but half of these patients will never need fewer doses.Single dose is associated with a higher likelihood of rupture.Two dose protocol shows promise but is to be evaluated fuher (refer pgno:163 sheila textbook of obstetrics 2 nd edition)', 'role': 'assistant'}]