## **Core Concept**
The procedure described involves the excision of a single lactiferous duct using a small fine probe. This is a surgical technique often used to manage issues related to a single duct, such as a solitary papilloma, which is a benign tumor growing in the milk duct of the breast.

## **Why the Correct Answer is Right**
The correct answer, **Microdochectomy**, is the surgical procedure used for the removal of a single lactiferous duct. This technique is particularly useful for diagnosing and treating conditions that affect a single duct, such as intraductal papillomas, which can cause nipple discharge. The procedure involves using a small probe to locate the affected duct, which is then excised and sent for pathological examination.

## **Why Each Wrong Option is Incorrect**
- **Option A: Hadfield's operation** - This is not a commonly recognized procedure related to the excision of a lactiferous duct.
- **Option B: Major duct excision** - This procedure involves the removal of multiple ducts and is typically performed for more extensive disease processes, not for solitary duct issues.
- **Option C: Duct excision** - While this term does involve the excision of ducts, it is too general and does not specifically denote the removal of a single duct as described.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that **Microdochectomy** is specifically indicated for patients with symptoms related to a single duct, such as bloody nipple discharge, and is a valuable diagnostic tool for identifying intraductal papillomas or other ductal pathology.

## **Correct Answer:** D. Microdochectomy