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
Legionella causes: 
Select and explain. 
A. Pontiac fever, B. Myocarditis, C. Diarrhea, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Ans. is. 'd' i. e., All of the above