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
First generation cephalosporins are active against? 
Select and explain. 
A. Gram negative bacteria, B. Gram positive bacteria, C. Anaerobes, D. Dermatophytes
B: Gram positive bacteria
Answer: B: Gram positive bacteria 
Explanation: Ans. is 'b' i.e., Gram positive bacteria