**Question:** 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 -

A. Aspergillosis
B. Fusidic acid infection
C. Mucormycosis
D. Penicilliosis

**Core Concept:**
Diabetic patients are at increased risk for opportunistic infections due to their compromised immune system, impaired wound healing, and high glucose levels. Infections caused by non-septate hyphae with obtuse branching are typically fungal in nature.

**Why the Correct Answer is Right:**
Non-septate hyphae and obtuse branching are characteristic features of fungal infections, particularly in the setting of a diabetic patient with ocular involvement. Among the given options, Aspergillosis (A) is the correct choice. Aspergillus species are known to cause invasive infections in immunocompromised individuals, including diabetics. The black pigmentation in the colony is due to the presence of melanin pigment produced by Aspergillus species.

**Why Each Wrong Option is Incorrect:**

B. Fusidic acid infection (Fusidic acid is an antibiotic used to treat skin and soft tissue infections, not relevant to the described fungal infection)
C. Mucormycosis (Mucormycosis is caused by Mucorales, typically septate hyphae, and does not involve obtuse branching)
D. Penicilliosis (Penicilliosis is a term for infection by Penicillium species, typically causing mycetoma, not ocular involvement in a diabetic patient)

**Clinical Pearl:**
Diabetic patients with persistent ocular symptoms and black, non-septate hyphae on culture should be evaluated for invasive fungal infections, especially Aspergillus species. Prompt diagnosis and treatment can prevent severe complications and vision loss.