Which of the following is a causative organism for whooping cough?

Correct option is B

Bordetella pertussis is the bacterium responsible for causing whooping cough, also known as pertussis. It primarily affects the respiratory system, causing severe coughing fits that end in a characteristic "whoop" sound. It is highly contagious and preventable through vaccination.
Explanation of each option:
· (a) Varicella-zoster – Incorrect. Varicella-zoster is the virus that causes chickenpox and shingles, not whooping cough.
· (b) Bordetella pertussis – Correct. This bacterium is the causative agent of whooping cough (pertussis).
· (c) Salmonella Typhi – Incorrect. Salmonella Typhi causes typhoid fever, a bacterial infection primarily affecting the intestines, not the respiratory system.
· (d) Treponema pallidum – Incorrect. Treponema pallidum is the bacterium that causes syphilis, a sexually transmitted infection, not whooping cough.