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 antibiotics class is not safe in pregnancy : 
Select and explain. 
A. Quinolones, B. Cephalosporins, C. Penicillins, D. Macrolides
A: Quinolones
Answer: A: Quinolones 
Explanation: None