## **Core Concept**
The potency of steroids can vary depending on their formulation and mode of administration. When comparing equivalent concentrations of steroids, the potency can differ based on their ability to penetrate the skin and their pharmacokinetic properties.

## **Why the Correct Answer is Right**
The correct answer, **.**, indicates that steroids are more potent in the form of creams or ointments when applied topically. This is because topical formulations allow for direct penetration of the steroid into the skin, where it can exert its anti-inflammatory and immunosuppressive effects locally. Creams and ointments are bases that help in delivering the steroid through the skin. Ointments, being more occlusive, generally enhance the penetration of the steroid through the skin compared to creams or lotions.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because the potency of steroids does not primarily depend on their oral formulation when considering topical application.
- **Option B:** This option is incorrect because, although injections can provide systemic effects, the question focuses on equivalent concentrations and potency in a specific form, implying a topical or local effect.
- **Option D:** This option is incorrect because solutions, although useful for certain skin conditions, typically do not provide as much potency as creams or ointments due to their lesser occlusivity and potentially lower concentration of the steroid.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that the potency of topical steroids can be classified into seven classes (I to VII), with Class I being the most potent. Additionally, the vehicle (cream, ointment, lotion) can affect the potency and penetration of the steroid. For example, ointments are generally more potent than creams due to their occlusive properties.

## **Correct Answer:** .