**Core Concept**
In phacoemulsification, anterior capsulotomy refers to the creation of a circular opening in the anterior lens capsule to access the nucleus. The most common and preferred technique is **capsulorhexis**, which ensures a smooth, circular, and controlled opening that preserves the integrity of the capsule and facilitates safe, predictable cataract surgery.

**Why the Correct Answer is Right**
Capsulorhexis is a precisely executed, circular incision in the anterior lens capsule, performed using a phacoemulsification probe. It is the standard method because it provides a stable, continuous opening that allows for optimal lens fragmentation, prevents posterior capsule rupture, and maintains the structural integrity of the lens capsule. The technique is performed with a circular motion using a microcatheter or phaco tip, and it is essential for safe and effective cataract extraction.

**Why Each Wrong Option is Incorrect**
Option A: *Can-opener capsulotomy* is a radial, non-circular incision that is rarely used in modern phacoemulsification due to high risk of posterior capsule rupture and irregular capsular injury.
Option B: *Intercapsular capsulotomy* involves cutting the lens nucleus without involving the capsule and is not a standard method; it is not used in phacoemulsification.
Option D: *Envelop capsulotomy* is a misnomer and not a recognized technique in ophthalmology; it may refer to a misinterpreted or outdated term.

**Clinical Pearl / High-Yield Fact**
Always perform **capsulorhexis** in phacoemulsification — it is the gold standard for anterior capsulotomy because it ensures a safe, circular opening that prevents complications like posterior capsule rupture and maintains postoperative visual outcomes.

✓ Correct Answer: C. Capsulorhexis