**Question:** Reducing sugar in urine can be detected by-

A. Glycosuria testing
B. Glucose oxidase method
C. Benedict's test
D. Folin-Ciocalteu reagent method

**Core Concept:** Detecting reducing sugars in urine involves the use of specific tests that react with the reducing groups (-OH) present in glucose molecules.

**Why the Correct Answer is Right:** A reducing sugar in urine, also known as glycosuria, is a condition where glucose levels are elevated in the urine due to impaired glucose tolerance or diabetes mellitus. Crystallization of glucose in urine leads to the formation of glucose crystals, which can be detected by Benedict's test (C). Benedict's test is based on the principle that glucose reacts with a copper(II) salt (cupric sulfate) to form a colored complex with a blue color in alkaline conditions. This test is simple, cheap, and widely available, making it a suitable choice for detecting glycosuria.

**Why Each Wrong Option is Incorrect:**

A. Glycosuria testing (Glycosuria testing is the process of testing for glycosuria, not a test itself)
B. Glucose oxidase method (This method is used for glucose measurement in blood, not urine)
D. Folin-Ciocalteu reagent method (This method is used for measuring reducing sugars in general, not specifically glucose in urine)

**Clinical Pearl:**

Detecting glycosuria is crucial in diagnosing diabetes mellitus and monitoring treatment efficacy. A positive result on a urine dipstick test, specifically for glucose (+++), indicates the need for further evaluation with a confirmatory test like Benedict's test (C).

**Correct Answer:** C. Benedict's test (Benedict's reagent) is a suitable method for detecting glycosuria because it is simple, cost-effective, and widely available. Benedict's test can be performed using a urine dipstick test, which is commonly used in clinical practice for preliminary screening of glycosuria. If the test is positive, confirmatory tests like glucose oxidase method may be required for accurate diagnosis and further evaluation.