**Core Concept**
Pustular Psoriasis is a rare and severe form of psoriasis characterized by widespread pustules, often accompanied by fever and malaise. In pregnant women, particularly those reaching term, it can pose a significant risk to both mother and fetus. The primary concern is the potential for severe maternal and fetal complications, including preterm labor and fetal distress.

**Why the Correct Answer is Right**
The management of pustular psoriasis in pregnancy is challenging due to the limited number of safe therapeutic options. The current consensus is that **Cyclosporine** is the drug of choice for managing pustular psoriasis in pregnant women, particularly when they are approaching term. Cyclosporine has been shown to be effective in controlling the symptoms of pustular psoriasis while minimizing the risk of adverse effects on the fetus. This is because cyclosporine is a potent immunosuppressant that inhibits the production of inflammatory cytokines, thereby reducing the severity of the disease.

**Why Each Wrong Option is Incorrect**
**Option A:** Methotrexate is a teratogenic agent that can cause severe birth defects, making it contraindicated in pregnancy. It is not suitable for managing pustular psoriasis in pregnant women.

**Option B:** Acitretin is a retinoid that can cause fetal abnormalities and is therefore contraindicated in pregnancy. It is not an appropriate choice for managing pustular psoriasis in pregnant women.

**Option C:** Biologics such as adalimumab and etanercept are not typically used in pregnancy due to the limited availability of safety data and the potential for fetal harm. However, in rare cases where the benefits outweigh the risks, they may be considered under close monitoring.

**Clinical Pearl / High-Yield Fact**
In pregnant women with pustular psoriasis, it is essential to weigh the risks and benefits of each treatment option carefully and consider consulting a dermatologist and a maternal-fetal medicine specialist for guidance.

**Correct Answer:** C. Cyclosporine.