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
Drug which is safe in pregnancy? 
Select and explain. 
A. Flouroquinolone, B. Sulfadiazine, C. Tetracycline, D. Penicillin
D: Penicillin
Answer: D: Penicillin 
Explanation: CHOICE OF DRUGS FOR COMMON PROBLEMS DURING PREGNANCY