52. Which one of the following statement about the immune system is correct?
(A) The innate immunity is found in all animals and plants.
(B) The adaptive immune response is activated before the innate response and develops quickly.
(C) The helper T cells recognize peptide antigens in major histocompatibility complex MHC class I molecules ondendritic cells.
(D) Perforin triggers blood vessels to dilate and become more permeable.
(E) The complement system provides innate defense by interfering with viruses and helping activate macrophages.