Read statement A-D `:- `
(A) When some one drinks lot of water, ADH release is decreased.
(B) Exposure to cold temperature suppress ADH release
(C ) Caffeine in Tea and coffee increase sodium absorption from DCT and collecting ducts
(D) ADH also cause vasodilation
Which statement are correct

Options

A. A and C
B. A and B
C. C and D
D. B and D

Answer

To determine which statements A-D are correct regarding the role of Antidiuretic Hormone (ADH), we will analyze each statement step by step.

### Step-by-Step Solution:

1. **Statement A: "When someone drinks a lot of water, ADH release is decreased."**
- When a person consumes a large amount of water, the body needs to excrete the excess fluid to maintain homeostasis. As a result, the secretion of ADH from the posterior pituitary gland decreases, leading to less water reabsorption in the kidneys and more dilute urine.
- **Conclusion:** This statement is **correct**.

2. **Statement B: "Exposure to cold temperature suppresses ADH release."**
- Cold temperatures can influence various hormonal responses in the body. However, exposure to cold typically does not suppress ADH release. In fact, it can sometimes lead to increased ADH release to conserve water and maintain body temperature.
- **Conclusion:** This statement is **incorrect**.

3. **Statement C: "Caffeine in tea and coffee increases sodium absorption from DCT and collecting ducts."**
- Caffeine is known to have a diuretic effect, which means it can increase urine production. It does not increase sodium absorption; rather, it can lead to increased sodium excretion. Caffeine primarily affects renal blood flow and glomerular filtration rate, but it does not enhance sodium reabsorption.
- **Conclusion:** This statement is **incorrect**.

4. **Statement D: "ADH also causes vasodilation."**
- ADH (also known as vasopressin) primarily functions to promote water reabsorption in the kidneys. It can cause vasoconstriction in certain blood vessels, but it is not responsible for vasodilation. Vasodilation is typically mediated by other factors such as the Atrial Natriuretic Factor (ANF).
- **Conclusion:** This statement is **incorrect**.

### Final Evaluation:
- **Correct Statements:** A
- **Incorrect Statements:** B, C, D

### Summary:
The only correct statement is **A**. Therefore, the answer is that only statement A is correct.