Which of the following is caused by Treponema palladium?

Step 1: Analyze the question The question asks which disease is caused by Treponema pallidum (written as "palladium" in the question, which is a typo; palladium is a metal, not an organism).

Step 2: Explain the concept Diseases are linked to specific causative organisms. Here are the ones in the options:

| Disease | Causative organism | Type | |---|---|---| | Gonorrhea | Neisseria gonorrhoeae | Bacterium (diplococcus) | | Leprosy | Mycobacterium leprae | Bacterium | | Tuberculosis | Mycobacterium tuberculosis | Bacterium | | Syphilis | Treponema pallidum | Bacterium (spirochete) |

Step 3: Solve

• Treponema pallidum is a spiral-shaped bacterium (a spirochete).
• It causes syphilis, a sexually transmitted infection. It can also pass from mother to child during pregnancy (congenital syphilis).
• Gonorrhea is caused by Neisseria, leprosy and TB by Mycobacterium, so A, B and C are eliminated.

Step 4: Answer The correct option is D. Syphilis.

Tip: Link the name to the disease. "Treponema = The Syphilis germ", and remember it is spiral-shaped. For the other options, remember that Mycobacterium covers both leprosy and TB, while Neisseria is gonorrhea.