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Question 37A 45-year-old woman presents with heavy menstrual bleeding. Which investigation is most likely to provide a definitive diagnosis?A) Full blood countB) Thyroid function testsC) Pelvic ultrasoundD) Endometrial biopsyE) Serum ferritin levelAnswer: D) Endometrial biopsyExplanation: While other tests can provide valuable information, an endometrial biopsy is most likely to provide a definitive diagnosis, particularly to rule out endometrial hyperplasia or cancer in a perimenopausal woman with menorrhagia.