Secretion of interferon is which type of barrier?

Identify the wrong statement with reference to immunity.

Match List-$I$ with List-$II$:

List-$I$	List-$II$
$(a)$ Antibody	$(i)$ Cell-mediated immunity
$(b)$ $B$-lymphocytes	$(ii)$ Humoral immune response
$(c)$ $T$-lymphocytes	$(iii)$ $H_2L_2$
$(d)$ $T$-cells help $B$ cells to produce them	$(iv)$ Army of proteins

Mucosa-associated lymphoid tissue $(MALT)$ is found in:

Provide definitions/explanations for the following terms: $1$. Retrovirus,$2$. Antibody.

Assertion $A$: Acquired immunity is pathogen-specific. Reason $R$: Acquired immunity is characterized by memory. Which option is correct for Assertion $A$ and Reason $R$?