**Question:** Savlon contains:

A. Chlorhexidine Gluconate
B. Propylene Glycol
C. Isopropyl Alcohol
D. Benzalkonium Chloride

**Core Concept:** Savlon is a well-known topical antiseptic solution used for skin disinfection and wound cleaning. It is commonly used to prevent and treat infections caused by bacteria, viruses, and fungi. The active ingredients in Savlon play a vital role in its antimicrobial properties.

**Why the Correct Answer is Right:** Savlon contains D-Benzalkonium Chloride (D-BC), which is a quaternary ammonium compound with broad-spectrum antimicrobial activity against bacteria, viruses, and fungi. D-BC works by disrupting the cell membrane, causing leakage of cellular contents and ultimately leading to cell death.

**Why Each Wrong Option is Incorrect:**

A. Chlorhexidine Gluconate: This is another broad-spectrum antiseptic agent, but it does not contribute to the antimicrobial properties of Savlon. Chlorhexidine acts by binding to cell membranes and interfering with nucleic acid synthesis, while D-BC is the active ingredient responsible for the antimicrobial properties in Savlon.

B. Propylene Glycol: This is a solvent used to dissolve the active ingredients in Savlon and does not contribute to its antimicrobial activity.

C. Isopropyl Alcohol: Isopropyl alcohol, also known as rubbing alcohol, is an antiseptic agent that acts by disrupting the cell membrane and damaging cellular components. However, it is not the primary antimicrobial agent in Savlon.

**Clinical Pearl:** The presence of multiple antiseptic agents in Savlon provides a synergistic effect, meaning the combination of D-BC, propylene glycol, and isopropyl alcohol enhances the overall antimicrobial activity of the solution compared to using any single agent alone. This synergistic effect makes Savlon an effective topical antiseptic for skin disinfection and wound cleaning.