**Question:** The granules discharged in mycetoma contains -

A. Amphotericin B
B. Calcium carbonate
C. Siderophores
D. Proteins and enzymes

**Core Concept:** Mycetoma is a granulomatous infection caused by fungi or bacteria. The granules discharged from the affected area contain substances produced by the infecting organism.

**Why the Correct Answer is Right:** In mycetoma, the granules discharged are formed as a defense mechanism by the host to contain and limit the spread of the infection. The granules contain proteins and enzymes produced by the infecting organism. These enzymes degrade the surrounding tissue and create the characteristic "corncob" appearance of the lesions.

**Why Each Wrong Option is Incorrect:**

A. Amphotericin B is an antifungal drug used for treating systemic fungal infections but is not produced by the infecting organism in mycetoma.
B. Calcium carbonate is a mineral found in the environment and does not represent the contents of the granules in mycetoma.
C. Siderophores are iron-chelating molecules produced by certain bacteria and fungi, not relevant to the contents of mycetoma granules.

**Clinical Pearl / High-Yield Fact:** Mycetoma is primarily caused by fungi or bacteria, and the granules contain proteins and enzymes produced by the infecting organism. This knowledge is crucial for understanding the pathogenesis and appropriate management of mycetoma cases.