**Core Concept**
The choice of intraocular lens (IOL) implantation depends on the surgical approach, patient's anatomy, and the desired outcome. In phacoemulsification, the posterior chamber IOL is preferred due to its minimal invasiveness and reduced risk of complications.

**Why the Correct Answer is Right**
The posterior chamber IOL is placed in the posterior chamber of the eye, between the iris and the lens capsule. This location provides optimal optics and reduces the risk of complications such as iris damage or chronic inflammation. The posterior chamber IOL is also more biocompatible and less likely to cause uveitis or glaucoma compared to other types of IOLs. The anterior chamber IOL, on the other hand, is placed in the anterior chamber and can cause chronic inflammation and glaucoma.

**Why Each Wrong Option is Incorrect**
**Option A:** The anterior chamber IOL is less preferred due to its association with chronic inflammation and glaucoma.
**Option C:** Iris-supported IOLs are rarely used now and are associated with a higher risk of complications, such as iris atrophy and chronic inflammation.
**Option D:** Angle-supported IOLs are also rarely used and can cause chronic inflammation and glaucoma due to the presence of the IOL in the angle of the eye.

**Clinical Pearl / High-Yield Fact**
Always remember that the choice of IOL depends on the surgical approach and patient's anatomy. In phacoemulsification, the posterior chamber IOL is the preferred choice due to its minimal invasiveness and reduced risk of complications.

**✓ Correct Answer: B. Posterior chamber**