Most toxic nitrogenous waste product among following is

Options

A. Ammonia
B. Urea
C. Uric acid
D. Amino acids

Answer

To determine the most toxic nitrogenous waste product from the given options (ammonia, urea, uric acid, amino acids), we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Types of Nitrogenous Waste:**
- There are three primary types of nitrogenous waste: ammonia, urea, and uric acid.

2. **Examine Ammonia:**
- Ammonia is known to be highly toxic. It requires a large amount of water for its excretion, making it suitable for organisms that have access to abundant water (ammoniotelic organisms).

3. **Examine Urea:**
- Urea is moderately toxic compared to ammonia. It is excreted by ureotelic organisms and requires less water than ammonia for excretion.

4. **Examine Uric Acid:**
- Uric acid is the least toxic of the three and is excreted by uricotelic organisms. It is excreted in a semi-solid form, which conserves water.

5. **Evaluate the Options:**
- The options provided are ammonia, urea, uric acid, and amino acids.
- Among these, ammonia is the most toxic nitrogenous waste product.

6. **Conclusion:**
- Based on the toxicity levels of the nitrogenous wastes discussed, the correct answer is **ammonia** (option A).

### Final Answer:
The most toxic nitrogenous waste product among the options is **ammonia**.