Answer:
Biology
Step-by-step explanation:
Study of various organ systems including the endocrine system of human provided information about the role of insulin hormone in the regulation of blood sugar level. It elucidated the role of insulin in the development of diabetes.
Once information about the causes of the diabetes was obtained, the development of methods of its treatment became possible by targeting the regulation of normal insulin level in the body. This is how the study of biology helped in the development of treatment and medicines for disease such as diabetes.