**Core Concept**
Cyclosporine-induced hypertension is a common side effect of immunosuppressive therapy, particularly in organ transplant patients. This condition is characterized by an increase in blood pressure due to the vasoconstrictive properties of cyclosporine, which leads to decreased renal perfusion and increased renin-angiotensin-aldosterone system (RAAS) activity.

**Why the Correct Answer is Right**
The correct treatment for cyclosporine-induced hypertension is to use a calcium channel blocker, which counteracts the vasoconstrictive effects of cyclosporine by relaxing vascular smooth muscle and reducing peripheral resistance. This is in contrast to other antihypertensive agents that may worsen kidney function or interact with cyclosporine. Nifedipine, a calcium channel blocker, is particularly effective in this setting due to its ability to reduce blood pressure without significantly affecting renal function.

**Why Each Wrong Option is Incorrect**
**Option A:** Clonidine is an alpha-2 adrenergic agonist that can worsen kidney function by reducing renal blood flow, making it a poor choice for treating cyclosporine-induced hypertension.

**Option B:** Enalapril is an ACE inhibitor that can worsen kidney function in patients on cyclosporine, as it can increase the levels of toxic metabolites of cyclosporine and reduce renal perfusion.

**Option D:** Methyl dopa is a centrally acting antihypertensive agent that can cause sedation and is not effective in treating cyclosporine-induced hypertension.

**Clinical Pearl / High-Yield Fact**
When treating cyclosporine-induced hypertension, it is essential to choose an antihypertensive agent that does not worsen kidney function or interact with cyclosporine. Calcium channel blockers, such as nifedipine, are generally preferred due to their efficacy and safety profile.

**Correct Answer:** C. Nifedipine