Oral Hypoglycaemics, Classes of Oral Hypoglycaemic Agents, Metformin, Sulphonylureas, Alpha Glucosidase Inhibitors, Meglitinides, Thiazolidinediones, Functions of Insulin, Types of Insulin, Rapid - Acting Insulin, Short Acting Insulin, Intermediate Acting Insulin, Biphasic Insulin, Human Insulin Mixture, Glucagon, Oral Glucose Tolerance Test (OGTT)