Read the statements (A - E) and answer the question following them.

$\mathrm{A}\mathrm{ }-$ Rheumatoid arthritis is an auto-immune disease.
$\mathrm{B}\mathrm{ }-$ During allergy, IgA type antibodies increase in plasma.
$\mathrm{C}\mathrm{ }-$ Injection given to patients of snakebite, possess antibiotics.
$\mathrm{D}\mathrm{ }-$ Humoral immunity is because of B-cells.
$\mathrm{E}\mathrm{ }-\mathrm{ }$ Interferons are an example of a cytokine barrier.

Identify the number of true statements?