This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteria, Subject name: Microbiology
Dark field microscopy is used for - 
Select and explain. 
A. Syphilic, B. Leprosy, C. Histoplasmosis, D. Capsule
A: Syphilic
Answer: A: Syphilic 
Explanation: Ans. is 'a' i.e., Syphilic * Dark ground (dark field) microscopy is used for -# Flagella# SpirochetesNote: T pallidum (causative agent of syphilis) is a spirochete.