system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Which of the following would be most likely causing methotrexate therapy failure in ectopic pregnancy treatment.
assistant
The correct answer is  With methotrexate therapy, serum β-hcG levels should decline. If β-hcG rises then it is failure of medical management.