Which one of the following pairs of the kind of cells and their secretion is correctly matched ?
(a) Oxyntic cells --- a secretion with pH between 2.0 and 3.0
(b) Alpha cells of islets of Langerhans ---- secretion that decreases blood sugar level
(c) Kupffer cells --- a digestive enzyme that hydrolyses nucleic acids
(d) Sebaceous glands --- a secretion that evaporates for cooling