## **Core Concept**
The management of syphilis in pregnant women is crucial to prevent congenital syphilis and its complications. The recommended treatment aims to effectively eliminate *Treponema pallidum*, the causative organism of syphilis, while considering the safety of both the mother and the fetus.

## **Why the Correct Answer is Right**
The correct answer, **B. Penicillin G**, is the recommended treatment for syphilis in pregnant women. Penicillin G is effective against *Treponema pallidum* and is considered safe for use during pregnancy. The Centers for Disease Control and Prevention (CDC) and other health guidelines recommend Penicillin G as the first-line treatment for syphilis in pregnant women. It is administered parenterally, typically in a regimen that includes 2.4 million units of Penicillin G benzathine given intramuscularly once a week for three weeks for primary, secondary, or early latent syphilis, and for 4 weeks for late latent or latent syphilis of unknown duration.

## **Why Each Wrong Option is Incorrect**
- **Option A:** Ceftriaxone is an alternative treatment for syphilis in non-pregnant individuals but is not the first recommended choice for pregnant women due to limited data on its efficacy in pregnancy and potential resistance issues.
- **Option C:** Azithromycin has been studied as a potential single-dose treatment for syphilis but is not recommended for pregnant women due to concerns about resistance and efficacy.
- **Option D:** Doxycycline is contraindicated in pregnancy due to the risk of inhibiting bone growth and causing tooth discoloration in the developing fetus.

## **Clinical Pearl / High-Yield Fact**
A critical point to remember is that pregnant women with syphilis should be treated with Penicillin G regardless of their HIV status, and the treatment should be given under close medical supervision. Also, it's essential to ensure that the sexual partners of pregnant women with syphilis are screened and treated to prevent reinfection.

## **Correct Answer: B. Penicillin G**