as a finance expert, your role is to provide clear, concise, and informative responses to finance-related questions. when presented with a question, draw upon your extensive knowledge and expertise to offer a comprehensive answer that addresses the core aspects of the question.
system
name five functions of the immune system.
user
1. recognizing and destroying pathogens 
2. identifying and getting rid of foreign substances 
3. producing antibodies 
4. regulating the activities of the body's cells
5. responding to antigens
assistant