Determine the correct match for the given columns.
`{:("Column I","Column II"),("(a)Hyperparathyroidism","(i) Saltwater balance"),("(b) Oxytocin","(ii) Milk let down "),("(c) Aldosterone","(iii) Demineralization"),("(d) Luteinizing hormone","((iv) Maintains corpus luteum "):} `

Options

A. a - ii , b - I , c - iii , d - iv
B. a - iii, b - ii , c - iv , d - iv
C. a - ii , b - iii , c - iv , d - i
D. a - i , b - iv , c - iii , d - ii

Answer

To determine the correct match for the given columns, we will analyze each hormone in Column I and its corresponding function in Column II.

### Step-by-Step Solution:

1. **Hyperparathyroidism**:
- This condition is related to the parathyroid hormone (PTH), which is responsible for regulating calcium levels in the blood.
- In hyperparathyroidism, there is an excess secretion of PTH, leading to increased calcium levels and causing demineralization of bones.
- **Match**: (a) Hyperparathyroidism → (iii) Demineralization.

2. **Oxytocin**:
- Oxytocin is produced by the posterior pituitary gland and is primarily involved in the process of lactation.
- Its main function is to stimulate the ejection of milk from the mammary glands during breastfeeding.
- **Match**: (b) Oxytocin → (ii) Milk let down.

3. **Aldosterone**:
- Aldosterone is a hormone produced by the adrenal cortex and is classified as a mineralocorticoid.
- It plays a crucial role in regulating sodium and potassium levels in the body, thereby maintaining saltwater balance.
- **Match**: (c) Aldosterone → (i) Saltwater balance.

4. **Luteinizing Hormone (LH)**:
- LH is produced by the anterior pituitary gland and is essential for regulating the menstrual cycle and ovulation in females.
- It is responsible for maintaining the corpus luteum after ovulation.
- **Match**: (d) Luteinizing hormone → (iv) Maintains corpus luteum.

### Summary of Matches:
- (a) Hyperparathyroidism → (iii) Demineralization
- (b) Oxytocin → (ii) Milk let down
- (c) Aldosterone → (i) Saltwater balance
- (d) Luteinizing hormone → (iv) Maintains corpus luteum

### Final Answer:
The correct matches are:
- (a) → (iii)
- (b) → (ii)
- (c) → (i)
- (d) → (iv)

Thus, the correct option is **2nd option**.