Question

Which of the following is a bactericidal antibiotic?
(A) Ofloxacin
(B) Tetracycline
(C) Chloramphenicol
(D) Erythromycin

Answer 1

The exact definition of bactericidal antibiotic is that these are antibodies which kill a bacteria completely by creating a wall synthesis. Antibiotics are technically types of medicines or drugs which kill germs in our bodies.

Complete step by step answer
We know that bactericidal antibiotics are those that completely kill the bacteria.
We will see each options functionality:
Firstly Ofloxacin: it is a very strong antibiotic which is used to treat pneumonia. It shows bactericidal effects (killing bacteria) by inhibition of DNA gyrase. It comes under the category of bactericidal antibiotics, which means this antibiotic is used to kill all the bacteria that cause infection in the body systems.
Second is Tetracycline: it is used to fight the infection caused by bacteria. It is used to treat infections caused by bacteria in skin, intestines or other body systems. It basically comes under the category of bacteriostatic antibiotics, which means they stop the growth of bacteria by stopping the infection caused in our body system.
Third is Chloramphenicol: it is used to do treatment of different bacterial infections. It is used as treatment for plague and typhoid fever. It basically comes under the category of bacteriostatic antibiotics, which means they stop the growth of bacteria by stopping the infection caused in our body system.
Last is Erythromycin: it is used to treat wide varieties of bacterial infections. It can also be used to prevent the bacterial infections. It can be a treatment for sore throat. It basically comes under the category of bacteriostatic antibiotics, which means they stop the growth of bacteria by stopping the infection caused in our body system.
If we see all the explanations we will see that except Ofloxacin all comes under the category of bacteriostatic antibiotic which inhibit the growth of bacteria.
So the correct option is A Ofloxacin.

Note
Key point is to remember the definition or function of bactericidal antibiotics and bacteriostatic antibiotics respectively. The bacteriostatic means it keeps the bacteria in a stationary phase of growth and prevents them from growing. The bactericidal means that directly kills the bacteria.