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': 'IUGR is caused by all EXCEPT: March 2004 \nSelect and explain. \nA. Rh incompatibility, B. Smoking, C. Anemia, D. CRF', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A i.e. Rh incompatibility', 'role': 'assistant'}]