What is the function of a memory T cell?
A. To activate TC and TH cells during an active primary infection
B. To avoid autoimmune disorders by producing memory for self-antigens during T-cell development
C. To maintain an active T-cell response (TC or TH) after an infection is cleared
D. To provide an almost immediate response upon subsequent exposure to a specific pathogen
E. To suppress TC activity after a pathogen is cleared
Answer: D