What are CpG islands? DNA regions with many cytosine bases adjacent to guanine bases DNA regions with many cytosine–guanine base pairs DNA regions that are the sites of X inactivation in male mammals DNA regions that remove acetyl groups from histone tails DNA regions that form complexes with acetylase proteins

The answer would be b. it is a learned trait

the glands which are associated with each description is given below:

pancreas - is an endocrine and exocrine gland that secretes juices with enzymes for digestion. salivary glands- with protection and digestion in the mouth. liver- secretes bile for digestion.   lachrymal glands - secrete tears to moisten eyes and protect them from particles and infection.   sweat gland -regulates water, salt, and temperature. oil glands - to form a protective barrier on the skin.   goblet cells - secrete mucus for protection.