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
Which is a cause for occurance of congenital malformation in the foetus? 
Select and explain. 
A. CT abdomen, B. MRI, C. Doppler ultrasound, D. None of the above
A: CT abdomen
Answer: A: CT abdomen 
Explanation: (A) CT abdomen