## **Core Concept**
The breast is composed of glandular, fatty, and connective tissues. The glandular tissue is organized into lobes, which are responsible for milk production during lactation. Understanding the anatomy of the breast is crucial for surgical procedures such as lumpectomy.

## **Why the Correct Answer is Right**
The normal breast usually contains 15-20 lobes, each of which has its own duct system. These lobes are not sharply separated but are rather interconnected. The concept of separate lobes with distinct duct systems is essential for understanding how breast-conserving surgeries like lumpectomy can be performed. By removing a tumor from one lobe, the rest of the breast tissue can potentially remain intact, provided that the cancer has not spread diffusely.

## **Why Each Wrong Option is Incorrect**
* **Option A:** 5 lobes - This number underestimates the typical number of lobes in a breast. While it's true that the breast has a lobular structure, 5 lobes do not accurately reflect the usual anatomy.
* **Option B:** 10 lobes - Similar to option A, this underestimates the typical number. The breast's lobular structure is more complex.
* **Option D:** 25 lobes - This overestimates the usual number of lobes. While there can be variation, 25 is higher than the commonly cited estimate.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that breast-conserving surgery (like lumpectomy) followed by radiation is a common treatment for early-stage breast cancer. The goal is to remove the cancer while preserving as much of the breast as possible. Knowing that the breast is divided into multiple lobes helps in understanding the feasibility of such procedures.

## **Correct Answer:** C. 15-20.