Antibodies in our body are complex

Which of the following occurs in innate immunity?

Which of the following is not present in the structure of an antibody?

Which of the following is a pentameric immunoglobulin and is produced first in a primary response to an antigen?

Which of the following types of immunity is present at the time of birth and is a non-specific type of defense in the human body?

Which is an incorrect pair based on its role in the immune system?