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 drug is safe during pregnancy ? 
Select and explain. 
A. Aminoglycoside, B. Ampicillin, C. Chloramphenicol, D. Cotrimoxazole
B: Ampicillin
Answer: B: Ampicillin 
Explanation: None