Interferon is

In $T$-lymphocytes,what does the letter '$T$' stand for?

The defence mechanism of the body against different diseases is known as:

Differentiate between the following and provide examples for each:
$(a)$ Innate and acquired immunity
$(b)$ Active and passive immunity

Which of the following are autoimmune disorders?
$A$. Myasthenia gravis
$B$. Rheumatoid arthritis
$C$. Gout
$D$. Muscular dystrophy
$E$. Systemic Lupus Erythematosus $(SLE)$
Choose the most appropriate answer from the options given below:

$T$-cells mature in the . . . . . . .