This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
In a patient, corneal scraping reveals narrow angled septate hyphae, which of the following is likely etiologic agent - 
Select and explain. 
A. Mucor, B. Aspergillus, C. Histoplasma, D. Candida
B: Aspergillus
Answer: B: Aspergillus 
Explanation: Option a: Incorrect- Mucor has aseptate hyphae and not septate
Option b: Correct-Aspergillus causes fungal keratitis and has narrow angled septate branching hyphae
Option c: Incorrect- Histoplasma does not cause fungal keratitis
Option d: Incorrect- Candida characteristically shows budding yeast-like cell morphology and also does not cause fungal keratitis.