Which of the following is an $STD$
Measles
Syphilis
Diphtheria
Cancer
It constitutes about $50$ percent of the lymphoid tissue in human body.
Explain Adolescence in detail?
The figure given below shows an antibody molecule. Name the parts $A, B$ and $C$
‘Polio' is caused by
The cells which suppress the entire immune system from its attack in the same body are known as