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
Detergents used to disinfect dental instruments in the office kill bacteria by interfering with functions of the cell 
Select and explain. 
A. wall, B. nucleus, C. membrane, D. capsule
C: membrane
Answer: C: membrane 
Explanation: None