Identify the receptors present on $T_{H}$ cells and $T_{C}$ cells,respectively.

Which of the following cells are involved in the defence mechanism of the body?

Person '$A$' cannot step out of his house. He has to spend his entire life in sterile isolation; otherwise, he would quickly contract a fatal infection. This person has almost no effective immune system. This disease is also called '$baby$ $in$ $a$ $bubble$ $syndrome$'. Identify the disease this person '$A$' is suffering from.

Which of the following types of immunity does not possess the characteristic of memory?

Where are $B$-cells and $T$-cells formed? How do they differ from each other?

The protein that possesses the property of immunity is .........