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
What is true about Histoplasmosis - 
Select and explain. 
A. In early stage it is indistinguishable from TB, B. Culture is not diagnostic, C. Mycelial forms are infectious form, D. Person to person spread occurs by droplet infection
C: Mycelial forms are infectious form
Answer: C: Mycelial forms are infectious form 
Explanation: Chronic cavitary histoplasmosis is seen in smokers who have structural lung disease (e.g. bullous emphysema) is characterized upper-lobe infiltrates, cavitation, and pleural thickening- mimics cavitary tuberculosis.
Isolation of fungi by culture and demonstration of dimorphism is diagnostic.
Reservoir of infection: Soil
Microconidia (spores) are the infective form and mode of infection is inhalation.
Person to person or animal to man transmission in not known so far for Histoplasmosis.