**Core Concept**
Corticosteroids are a class of medications that mimic the effects of cortisol, a hormone produced by the adrenal gland. They are used to treat a variety of conditions, including inflammatory and autoimmune disorders, due to their potent anti-inflammatory and immunosuppressive properties.

**Why the Correct Answer is Right**
Corticosteroids are indicated for the treatment of severe allergic reactions, such as anaphylaxis, because they help to reduce inflammation and alleviate airway constriction. They also play a crucial role in managing conditions like asthma, where they help to decrease inflammation in the airways. Additionally, corticosteroids are used to treat conditions like temporal arteritis, where they help to reduce inflammation in the blood vessels.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because while corticosteroids may be used to treat conditions like hypertension, they are not a first-line treatment and are not indicated for this specific condition.
**Option B:** This option is incorrect because while corticosteroids may be used to treat conditions like osteoporosis, they are not a primary treatment and are not indicated for this specific condition.
**Option C:** This option is incorrect because while corticosteroids may be used to treat conditions like rheumatoid arthritis, they are not a primary treatment and are not indicated for this specific condition.

**Clinical Pearl / High-Yield Fact**
One of the most important things to remember when using corticosteroids is that they should be used at the lowest effective dose for the shortest duration possible to minimize the risk of side effects. This is especially important in patients with conditions like diabetes, where corticosteroids can worsen glucose control.

**Correct Answer: C. Temporal arteritis**