Question

Primary lesions called chancre are formed at the site of infection by ___________.

• A. Diplococcus pneumoniae
• B. Treponema pallidum
• C. Salmonella typhi
• D. Wuchereria bancrofti

Hint:

Chancre is the diagnostic feature of primary syphilis.

Answer 1

The Correct Option is B

Step 1: Understanding chancre.
A chancre is a painless ulcer that appears at the site of infection during the primary stage of syphilis.
Step 2: Causative organism.
Syphilis is a sexually transmitted disease caused by the spirochaete bacterium Treponema pallidum.
Step 3: Analysis of options.
(A) Diplococcus pneumoniae: Causes pneumonia.
(B) Treponema pallidum: Correct — causes syphilis and primary chancre.
(C) Salmonella typhi: Causes typhoid fever.
(D) Wuchereria bancrofti: Causes filariasis.
Step 4: Conclusion.
Primary lesions called chancre are formed due to infection by Treponema pallidum.