Which soluble molecules are included in the human immune system?

Which of the following barriers is $NOT$ included in innate immunity?

Antigen binds to antibody. The binding is the result of

What is the molecule that stimulates an immune response called?

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

Assertion : $A$ person who has received a cut and is bleeding needs to be given anti-tetanus treatment.
Reason : Anti-tetanus injection provides immunity by producing antibodies for tetanus.