This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Disorders of menstruation, Subject name: Gynaecology & Obstetrics
[{'content': 'Which of the following statements is true regarding amenorrhoea? \nSelect and explain. \nA. Reduced menstruation, B. It is a symptom and not a disease entity, C. It is always pathological, D. All of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Amenorrhoea is a symptom and not a entity. Amenorrhoea is the absence of menstruation. Amenorrhea can be physiological or pathological. Primary amenorrhea is defined as no menstruation by age 15. Secondary amenorrhea is defined as the absence of menses for 6 or more months or the length of 3 cycles after the establishment of regular menstrual cycles. Ref: Online resources', 'role': 'assistant'}]