**Question:** False + ye VDRL, is seen in all except -

A. Syphilis
B. Treponema pallidum
C. Human immunodeficiency virus (HIV)
D. Hepatitis B virus (HBV)

**Core Concept:** Treponemal tests are used to diagnose syphilis, a sexually transmitted infection caused by Treponema pallidum. VDRL (Venereal Disease Research Laboratory) is a non-treponemal test used as a screening test for syphilis, followed by a confirmatory test such as FTA-ABS (fluorescent treponemal antibody-absorbed test). False-positive results can occur due to various reasons.

**Why the Correct Answer is Right:** In this question, we are looking for a condition that would result in a false positive VDRL test result. The correct answer is not syphilis (A), as false-positive VDRL tests due to Treponema pallidum would actually indicate a true positive result for syphilis. Treponemal tests are specific for Treponema pallidum, so a false positive would indicate a non-syphilis infection.

**Why Option B is Incorrect:** Treponemal tests, including VDRL, are highly specific for Treponema pallidum and do not cross-react with other pathogens. Hence, option B (Treponemal infection) is incorrect as it would not result in a false positive VDRL test result.

**Why Option C is Incorrect:** HIV infection is caused by the human immunodeficiency virus (HIV) and is not associated with a false-positive VDRL test result. The VDRL test is specific for Treponema pallidum and does not cross-react with HIV.

**Why Option D is Incorrect:** Hepatitis B virus (HBV) infection is caused by the hepatitis B virus and does not result in a false-positive VDRL test result. VDRL is specific for Treponema pallidum, and a false-positive result would indicate a non-Hepatitis B infection.

**Why Option E is Incorrect:** Toxoplasmosis is caused by the protozoan parasite Toxoplasma gondii and is not associated with a false-positive VDRL test result. VDRL tests are specific for Treponema pallidum and do not cross-react with Toxoplasmosis.

**Core Concept:** False-positive results in Treponemal tests like VDRL occur due to non-specific reactions with other pathogens like HIV, syphilis, and other treponemal infections. A false-positive result in a VDRL test indicates a non-treponemal infection or a non-specific reaction.

**Clinical Pearls:** False-positive results in VDRL tests can be caused by non-trephonemal infections, such as HIV, syphilis, and other treponemal infections. A false-positive result indicates a non