**Question:** Congenital rubella causes all EXCEPT:

A. Congenital cataracts
B. Congenital heart defects
C. Congenital syphilis
D. Congenital toxoplasmosis

**Core Concept:** Rubella, also known as German Measles, is a viral infection caused by the Rubella virus. Congenital rubella syndrome (CRS) is the term used for the group of medical problems in newborns resulting from maternal infection with the Rubella virus during pregnancy. These medical problems can have significant impact on the child's health and development.

**Why the Correct Answer is Right:** Congenital syphilis (C. syphilis) is caused by the bacterium Treponema pallidum and is transmitted sexually. On the other hand, congenital rubella (C. rubella) is caused by the Rubella virus and is transmitted through respiratory droplets, direct contact, or blood products. The correct answer, C. syphilis, is not mentioned because it is a separate disease caused by a different agent (Treponema pallidum) and transmitted through a different mode (sexual contact).

**Why Each Wrong Option is Incorrect:**

A. Congenital cataracts: This is a possible complication of congenital rubella, so this is incorrect.

B. Congenital heart defects: This is a possible complication of congenital rubella, so this is incorrect.

D. Congenital toxoplasmosis: Although congenital toxoplasmosis (CTX) is caused by the protozoan Toxoplasma gondii, it shares some similarities with congenital rubella. However, the key difference lies in the mode of transmission. Congenital toxoplasmosis is transmitted through the placenta, while congenital rubella is transmitted through respiratory droplets, direct contact, or blood products.

**Clinical Pearl:**

Understanding the differences between these diseases is essential for healthcare providers managing pregnant women to prevent and diagnose congenital infections. By being aware of the mode of transmission, clinicians can implement appropriate preventive measures and diagnose these infections early on to provide timely interventions and minimize the adverse effects on the developing fetus.