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
Dark ground microscopy is used for detection of ? 
Select and explain. 
A. Spirochetes, B. Chlamydia, C. Fungi, D. Virus
A: Spirochetes
Answer: A: Spirochetes 
Explanation: Ans. is 'a' i.e., Spirochetes