Identify A, B and C in the given table-

$\begin{array}{ccc}\text{Gland}& \text{Secretion}& \text{Function}\\ A& \text{Estrogen}& \text{Secondary sexual character}\\ \alpha -\text{cells of Langerhans}& \text{B}& \text{Increases blood sugar level}\\ \text{Anterior lobe of pituitary}& \text{C}& \text{Over secretion leads to gigantism}\end{array}$

The correct option is C A - Ovary, B - Glucagon, C - GH
Ovary secretes the estrogen hormone in females which maintains the secondary sexual characters.
$\alpha$ - cells of Langerhans (Pancreas) secretes glucagon hormone which increases blood glucose level by covering glycogen to glucoses. Anterior lobe of Pituitary gland
secretes growth hormone which maintains the growth of an organism. Over secretion of Growth hormone leads to gigantism in children and acromegaly in adults.

So, the correct answer is option-a.