Which of the following statements about the immune response are incorrect ?
A. Neutrophils possess lobed nucleus.
B. Hormones are key mediators of an immune response.
C. Macrophages can be found in tissues throughout the body.
D. Eosinophils are the first cells to reach a site of infection.
E. The components of complement cascade are present in blood as inactive zymogens.
Choose the correct answer from the options given below :