**Core Concept**
Methotrexate is a folate antagonist used in the treatment of various inflammatory conditions, including arthritis. It works by inhibiting dihydrofolate reductase (DHFR), an enzyme essential for DNA synthesis and repair. This mechanism is crucial for its teratogenic effects, as it can interfere with fetal development during pregnancy.

**Why the Correct Answer is Right**
The correct approach is to stop methotrexate for at least 3 months before conception to minimize the risk of teratogenic effects. Methotrexate is a category X medication, meaning it has a strong potential to cause harm to the fetus. The folate antagonist effect can lead to congenital anomalies, such as craniofacial abnormalities, limb defects, and central nervous system malformations. Stopping methotrexate for an adequate period allows the body to replenish its folate stores, reducing the risk of adverse effects on fetal development.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it suggests stopping methotrexate but does not provide a clear timeframe for resuming treatment. In reality, the American College of Rheumatology recommends stopping methotrexate for at least 3 months before conception, but the exact duration may vary depending on the individual patient and disease severity.

**Option B:** This option is incorrect because it suggests continuing contraception for 1 year after stopping methotrexate. While it is essential to avoid pregnancy during methotrexate treatment, the recommended duration of contraception after stopping the medication is typically 3 months, not 1 year.

**Option C:** This option is incorrect because it advises immediate conception without stopping methotrexate. This approach is not recommended due to the high risk of teratogenic effects associated with methotrexate exposure during pregnancy.

**Option D:** This option is incorrect because it suggests adoption as an alternative to conceiving naturally. While adoption can be a viable option for some individuals, it is not a relevant solution in this scenario.

**Clinical Pearl / High-Yield Fact**
It is essential to counsel patients on the teratogenic effects of methotrexate and the importance of stopping the medication for an adequate period before conception. A mnemonic to remember is "FOLATE": F - Folate antagonist, O - Ongoing risk of teratogenic effects, L - Limit exposure during pregnancy, A - Adequate time to replenish folate stores, T - Teratogenic effects can be minimized with proper planning, E - Essential to counsel patients on the risks and benefits of methotrexate.

**✓ Correct Answer: A. Husband should stop methotrexate and wife should continue contraception for 3 months**