This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2019, Subject name: Microbiology
Leginonnaire disease cause? 
Select and explain. 
A. Respiratory disease, B. U.T.I, C. Retroperitoneal fibrosis, D. Acute gastroenteritis
A: Respiratory disease
Answer: A: Respiratory disease 
Explanation: Legionellosis ( Atypical pneumonia) Fever, muscle pain, headache Bacterium found in AC fresh water Spread by breathing Diagnosis By urinary Antigen test & Sputum culture Treatment - Fluroquinolones, Azithromycin or doxycycline Culture for legionella - BCYE (Buffered charchol yeast Extract with Fe & Cysteine)