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: Dental
The periodontal pocket principally contains 
Select and explain. 
A. Living and degenerated leucocytes, B. Microorganisms, their products and debris, C. Gingival fluids and salivary mucin, D. Desquamated epithelial cells
B: Microorganisms, their products and debris
Answer: B: Microorganisms, their products and debris 
Explanation: None