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
All of the following are ture regarding cephalosporins except - 
Select and explain. 
A. Bactericidal agents, B. Active against only gram negative bacteria, C. IIIrd generation are resistant to beta-lactamases from gram negative bacteria, D. Ceftriaxone is administered parenterally
B: Active against only gram negative bacteria
Answer: B: Active against only gram negative bacteria 
Explanation: Ans. is 'b' i.e., Active against olny gram negative bacteria Cephalosporins are active against gram positive as well as gram negative bacteria, and are bactericidal. o Ceftriaxone is a parentral cephalosporin. o Third generation cephalosporins are highly resistant to beta-lactamases from gram negative bacteria.