Which immunoglobulin is present in mother's milk?

Which of the following statements are correct?
$(1)$ Yoga is practiced to achieve physical and mental health.
$(2)$ Infectious diseases are very common; all of us have suffered from one or the other at some time.
$(3)$ $AIDS$ is an infectious disease.
$(4)$ Cancer is a non-infectious disease.
$(5)$ $A$ healthy person contributes to economic prosperity.

Which of the following diseases is an autoimmune disorder?

What is the Pulse Polio Programme of the Government of India? What is $OPV$? Why is it that India is yet to eradicate Polio?

Why are surgical instruments boiled in water before use?

Assertion $A$: The spleen is a large reservoir of lymphocytes.
Reason $R$: The spleen acts as a filter of the blood by trapping blood-borne microorganisms.
Which option is correct for Assertion $A$ and Reason $R$?