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: Pathology
Feulgen reaction is used to detect? 
Select and explain. 
A. mRNA, B. rRNA, C. ssDNA, D. tRNA
C: ssDNA
Answer: C: ssDNA 
Explanation: Feulgen reaction is semi quantitative method to identify DNA(ss DNA,ds DNA any type of DNA).The staining intensity is directly proportional to DNA concentration