## **Core Concept**
Extra-capsular cataract extraction (ECCE) is a surgical technique used to remove a cataractous lens while leaving the elastic lens capsule intact. This method involves the removal of the lens nucleus and cortex, but the posterior capsule is preserved.

## **Why the Correct Answer is Right**
In ECCE, the part of the lens that is excised includes the **nucleus** and the **cortex**, but the posterior capsule is left intact. This technique allows for the removal of the opaque lens material while providing a barrier between the anterior and posterior segments of the eye.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because it does not accurately represent the part of the lens excised in ECCE.
- **Option B:** This option is incorrect as it inaccurately describes the portion of the lens removed during ECCE.
- **Option D:** This option is incorrect because it does not correctly identify the part of the lens that is excised in extra-capsular cataract surgery.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that ECCE is often used in settings where phacoemulsification (a more modern technique) is not available. The main advantage of ECCE is its simplicity and lower equipment requirements compared to phacoemulsification.

## **Correct Answer:** B. cortex and nucleus.