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
Primary amenorrhoea is most commonly associated with: 
Select and explain. 
A. Developmental defect of the genital tract, B. Tuberculosis, C. Endocrine disorders, D. Chromosomal abnormality
D: Chromosomal abnormality
Answer: D: Chromosomal abnormality 
Explanation: None