This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Mycology, Subject name: Microbiology
Sulphur granules are composed of - 
Select and explain. 
A. Fungal filaments, B. Leukocytes, C. Erythrocytes, D. Keratinocytes
A: Fungal filaments
Answer: A: Fungal filaments 
Explanation: Ultrastructurally, the center of the sulfur granule was composed of a cluster of hyphae, and the periphery was surrounded by clubs arranged radially. The clubs were made of electron-dense fine granules and had a degenerated hypha at the center. These granules varied in amount from small to large. Microscopy of the granules reveal very thin fungal filaments