Given below is an incomplete table about certain hormones , their source glands and one major effect of each on the body in humans . Identify the correct option for the three blanks A, B and C :
`{:("Gland" , "Secretion" , "Effect on Body"), ("A" , "Oestrogen" , "Maintenance of secondary sexual characters"), ("Alpha cells of Islets of " , "B", "Raises blood sugar level"), ("Langerhans Anterior pituitary" , "C", "Over secretion leads to gigantism"):}`

Options

A. `{:(, " "A , " "B , " "C), ((1), "Ovary" , "Glucagon" , "Growth hormone"):}`
B. `{:(, " "A , " "B , " "C), ((2), "Placenta" , "Insulin" , "Vasopressin"):}`
C. `{:(, " "A , " "B , " "C), ((3), "Ovary" , "Insulin" , "Calcitonin"):}`
D. `{:(, " "A , " "B , " "C), ((4), "Placenta" , "Glucagon" , "Calcitonin"):}`

Answer

To solve the question regarding the incomplete table of hormones, their source glands, and their effects on the body, we will identify the correct options for the blanks A, B, and C step by step.

### Step-by-Step Solution:

1. **Identifying A (Oestrogen)**:
- The hormone Oestrogen is primarily associated with the female reproductive system.
- It is secreted by the **ovaries** and also by the **corpus luteum** after ovulation.
- Therefore, for blank A, the correct gland is **Ovary** (or Corpus Luteum).

2. **Identifying B (Raises blood sugar level)**:
- The alpha cells of the Islets of Langerhans are located in the **pancreas**.
- These alpha cells secrete **glucagon**, which is responsible for raising blood sugar levels.
- Thus, for blank B, the correct secretion is **Glucagon**.

3. **Identifying C (Over secretion leads to gigantism)**:
- The anterior pituitary gland secretes several hormones, one of which is the **growth hormone** (also known as somatotropin).
- Over secretion of growth hormone during childhood can lead to a condition known as gigantism.
- Therefore, for blank C, the correct secretion is **Growth Hormone**.

### Final Answers:
- A: Ovary
- B: Glucagon
- C: Growth Hormone