**Core Concept**
Pustular psoriasis is a rare and severe form of psoriasis characterized by widespread pustules on the skin. In pregnancy, the treatment of pustular psoriasis requires careful consideration to avoid harm to the fetus. The drug of choice should have a favorable safety profile for both the mother and the fetus.

**Why the Correct Answer is Right**
The drug of choice for pustular psoriasis in pregnancy is **Methotrexate**. However, due to its teratogenic potential, it is usually avoided in pregnancy. In the case of pustular psoriasis, the risk of flares and complications may outweigh the risk of methotrexate. However, given its teratogenic effects, it should be used with caution and only when other options are not available. This is because **Methotrexate** is a **folate antagonist**, which can interfere with fetal development.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not provided.
* **Option B:** This option is not provided.
* **Option C:** This option is not provided.

**Clinical Pearl / High-Yield Fact**
In pregnant patients with pustular psoriasis, it is essential to weigh the risks and benefits of treatment. Corticosteroids may be used in the short-term, but their long-term use can have adverse effects on the fetus. Therefore, close monitoring and careful management are crucial to prevent complications.

**Correct Answer:** C. Corticosteroids can be used in short-term management.