This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Gynaecology & Obstetrics
[{'content': 'Primary amenorrhoea is most commonly associated with: \nSelect and explain. \nA. Developmental defect of the genital tract, B. Tuberculosis, C. Endocrine disorders, D. Chromosomal abnormality', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]