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: Pharmacology
Which of the following antihypertensive drugs is contraindicated in pregnancy: 
Select and explain. 
A. Labetalol, B. Hydralazine, C. Nifedipine, D. ACE inhibitors
D: ACE inhibitors
Answer: D: ACE inhibitors 
Explanation: None