This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Obs), Subject name: Gynaecology & Obstetrics
[{'content': 'Which is a cause for occurance of congenital malformation in the foetus? \nSelect and explain. \nA. CT abdomen, B. MRI, C. Doppler ultrasound, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (A) CT abdomen', 'role': 'assistant'}]