Consider the following four statements (i-iv) and select the option that correctly identifies the true (T) and false (F) ones.
(i). Atrial natriuretic factor can cause vasodilation (dilation of blood vessels) and thereby decreases the blood pressure.
(ii). On an average, 60-70 gm of urea is excreted out per day.
(iii). Sebaceous glands eliminate certain substances like NaCl, urea and lactic acid through sebum.
(iv). PCT is lined by simple cuboidal brush border epithelium which increases the surface area for reabsorption.

Options

A. a) `{:("(i)","(ii)","(iii)","(iv)"),(F,F,T,T):}`
B. b) `{:("(i)","(ii)","(iii)","(iv)"),(F,T,T,T):}`
C. c) `{:("(i)","(ii)","(iii)","(iv)"),(T,F,F,T):}`
D. d) `{:("(i)","(ii)","(iii)","(iv)"),(T,T,F,T):}`

Explanation

To determine the truth value of each statement regarding excretory products and their elimination, we will analyze each statement step by step.

### Step-by-Step Solution:

1. **Statement (i)**: "Atrial natriuretic factor can cause vasodilation (dilation of blood vessels) and thereby decreases the blood pressure."
- **Analysis**: Atrial natriuretic factor (ANF) is a hormone released by the heart's atria when blood pressure is high. It promotes vasodilation, which helps lower blood pressure by allowing blood vessels to widen.
- **Conclusion**: This statement is **True (T)**.

2. **Statement (ii)**: "On an average, 60-70 gm of urea is excreted out per day."
- **Analysis**: In a healthy individual, the typical amount of urea excreted daily is around 25-30 grams, not 60-70 grams. This statement overestimates the average urea excretion.
- **Conclusion**: This statement is **False (F)**.

3. **Statement (iii)**: "Sebaceous glands eliminate certain substances like NaCl, urea, and lactic acid through sebum."
- **Analysis**: Sebaceous glands primarily secrete sebum, which consists of lipids, waxes, and other organic compounds. They do not excrete NaCl, urea, or lactic acid. This statement is incorrect.
- **Conclusion**: This statement is **False (F)**.

4. **Statement (iv)**: "PCT is lined by simple cuboidal brush border epithelium which increases the surface area for reabsorption."
- **Analysis**: The proximal convoluted tubule (PCT) of the nephron is indeed lined with simple cuboidal epithelium that has microvilli (brush border), which increases the surface area for reabsorption of water, ions, and nutrients.
- **Conclusion**: This statement is **True (T)**.

### Summary of Truth Values:
- Statement (i): True (T)
- Statement (ii): False (F)
- Statement (iii): False (F)
- Statement (iv): True (T)

### Final Answer:
The correct identification of the statements is:
- (i) T
- (ii) F
- (iii) F
- (iv) T