To solve this problem, we need to match the hormones with their respective diseases. Let's analyze each hormone:$\newline \bullet$a. Insulin:$\newline$Insulin is a hormone produced by the pancreas that regulates blood glucose levels. A deficiency or resistance to insulin leads to Diabetes mellitus.$\newline$This matches with (ii).$\newline \bullet$b. Thyroxin:$\newline$Thyroxin is a hormone produced by the thyroid gland that regulates metabolism. A deficiency in thyroxin can lead to Goitre.$\newline$This matches with (iv).$\newline \bullet$c. Corticoids:$\newline$Corticoids are hormones produced by the adrenal cortex. A deficiency in corticoids can lead to Addison's disease.$\newline$This matches with (i).$\newline \bullet$d. Growth Hormone:$\newline$Growth hormone is produced by the pituitary gland and is responsible for growth and development. An excess of growth hormone can lead to Acromegaly.$\newline$This matches with (iii).$\newline$Now, let's match the items from the list:$\newline a \rightarrow ii, b \rightarrow iv, c \rightarrow i, d \rightarrow iii \newline$This corresponds to Option 3.