A diabetic patient presents with pus from eye . Colonies of isolated organisms are black with microscopic feature of non-septate hyphae and obtuse branching. Diagnosis is-
**Core Concept**
The underlying principle being tested is the identification of a fungal infection, specifically in a diabetic patient presenting with ocular symptoms. The key features to consider are the microscopic appearance of the organism and the clinical context. **Mucormycosis** is a critical diagnosis to consider in such cases.
**Why the Correct Answer is Right**
The description of non-septate hyphae with obtuse branching and the formation of black colonies is characteristic of **Mucorales**, the causative agents of mucormycosis. This infection is particularly concerning in diabetic patients due to their increased susceptibility. The presence of pus from the eye suggests an invasive infection, which is a medical emergency.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because it does not match the description provided.
**Option B:** Incorrect as it is not associated with the specific microscopic features mentioned.
**Option D:** Incorrect because the clinical presentation and microscopic features do not align with this option.
**Clinical Pearl / High-Yield Fact**
Mucormycosis is a life-threatening infection that requires prompt diagnosis and treatment, especially in immunocompromised patients like those with diabetes. The key to diagnosis is recognizing the combination of clinical presentation and microscopic features of the organism.
**Correct Answer:** D. Mucormycosis.