Mathc column I with column II and select the correct option from the codes given below.
`{:("Column I","Column II"),("Thyroid",(i)"Acts on the renal tubules"),("Adrenal",(ii)"Regulates blood calcium level"),("Pituitary",(iii)"Maintains diurnal rhythm of our body"),("Pineal",(iv)"Acts on the melanocytes"):}`

Options

A. iv,iii,ii,i
B. iii,iv,i,ii
C. iv,ii,iii,i
D. ii,i,iv,iii

Answer

To solve the matching question between Column I and Column II, we will analyze each gland in Column I and match it with its corresponding function in Column II.

### Step-by-Step Solution:

1. **Identify the Glands and Their Functions:**
- **Thyroid Gland:** The thyroid gland secretes hormones that regulate metabolism and calcium levels. The relevant function in Column II is to regulate blood calcium levels.
- **Adrenal Gland:** The adrenal gland produces hormones such as aldosterone, which acts on the renal tubules to regulate sodium and water balance. The relevant function in Column II is to act on the renal tubules.
- **Pituitary Gland:** The pituitary gland secretes several hormones, including the melanocyte-stimulating hormone (MSH), which acts on melanocytes. The relevant function in Column II is to act on the melanocytes.
- **Pineal Gland:** The pineal gland produces melatonin, which helps maintain the diurnal rhythm of the body (sleep-wake cycle). The relevant function in Column II is to maintain the diurnal rhythm of our body.

2. **Match Each Gland with Its Function:**
- Thyroid → (ii) Regulates blood calcium level
- Adrenal → (i) Acts on the renal tubules
- Pituitary → (iv) Acts on the melanocytes
- Pineal → (iii) Maintains diurnal rhythm of our body

3. **Final Matching:**
- Thyroid → (ii)
- Adrenal → (i)
- Pituitary → (iv)
- Pineal → (iii)

4. **Select the Correct Option:**
Based on the matches:
- Thyroid: (ii)
- Adrenal: (i)
- Pituitary: (iv)
- Pineal: (iii)

The correct matching sequence is:
- 2 (Thyroid) - 1 (Adrenal) - 4 (Pituitary) - 3 (Pineal)

Therefore, the correct option is **D**.