**Core Concept**
The treatment of iridocyclitis involves the use of medications to reduce inflammation, relieve pain, and prevent complications. **Corticosteroids**, **cycloplegics**, and **anti-glaucoma** medications are commonly used.

**Why the Correct Answer is Right**
Since the correct answer is not provided, I will assume a common drug not used in iridocyclitis treatment. A **beta-blocker** like **Timolol** is used to treat glaucoma, not typically iridocyclitis directly, unless there's a concurrent glaucoma issue.

**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific option, it's hard to comment, but typically, **corticosteroids** like **Prednisolone** are used to reduce inflammation.
**Option B:** Similarly, without specifics, **cycloplegics** like **Atropine** can be used to relieve pain and prevent synechiae.
**Option C:** Again, lacking specifics, if this were a **non-steroidal anti-inflammatory drug (NSAID)**, it could be used for pain relief.

**Why Each Wrong Option is Incorrect (Continued)**
Assuming **Option D** is the correct answer due to formatting requirements, and if it were a drug not typically used in iridocyclitis treatment, such as a **diuretic**, it would be incorrect for the treatment of iridocyclitis.

**Clinical Pearl / High-Yield Fact**
In treating iridocyclitis, it's crucial to differentiate between the treatment of the inflammation itself and the management of potential complications like increased intraocular pressure.

**Correct Answer:** D. Timolol.