Read the following statements and select the correct option.
Statement I: When the immune system fails to recognise ‘self’ from ‘nonself’ and starts destroying body’s own proteins, this leads to auto-immune diseases.
Statement II: Addison’s disease and rheumatoid arthritis are autoimmune diseases.

Select the correct option to fill up the blanks.
(i) Diseases which are easily transmitted from one person to another, are called__________diseases.
(ii) In human body, parasite of malaria initially multiplies within the_____________  and then attack the _______ .
(iii)_________  is the yellowish fluid secreted by mother during the initial days of lactation.
(iv) ______ and_________  are the primary lymphoid organs.