What do antibodies fight against?

Given below are two statements:
Statement $I:$ Autoimmune disorder is a condition where the body's defense mechanism recognizes its own cells as foreign bodies.
Statement $II:$ Rheumatoid arthritis is a condition where the body does not attack self-cells.
In the light of the above statements,choose the most appropriate answer from the options given below:

Lymphoid tissue is found in:

Select the $CORRECT$ statement.

Humans have an acquired immune system that produces antibodies to neutralize pathogens. Still,the innate immune system is present at the time of birth because it

The antibodies are