Which one of the following statements pertaining to pollutants is correct?

Options

A. DDT is a non-biodegradable pollutant
B. Excess fluoride in drinking water causes osteoporosis
C. Excess cadmium in drinking water causes black foot disease
D. Methyl mercury in water may cause "itai itai" disease

Answer

To determine which statement pertaining to pollutants is correct, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understand the Options**: We have four statements regarding different pollutants:
- A) DDT (Dichlorodiphenyl trichloroethane) is a non-biodegradable pollutant.
- B) Excess fluoride in drinking water causes osteoporosis.
- C) Excess cadmium in drinking water causes black foot disease.
- D) Methylmercury in water may cause Itai-Itai disease.

2. **Evaluate Option A**:
- DDT is known to be a non-biodegradable pollutant. It is an insecticide that cannot be decomposed by microorganisms such as bacteria and fungi. It can persist in the environment and cause harmful effects, making this statement correct.

3. **Evaluate Option B**:
- Excess fluoride in drinking water does not cause osteoporosis; instead, it causes fluorosis, which affects teeth and bones. Osteoporosis is primarily due to a deficiency of calcium. Therefore, this statement is incorrect.

4. **Evaluate Option C**:
- Excess cadmium in drinking water does not cause black foot disease. Instead, cadmium poisoning leads to Itai-Itai disease, which is characterized by skeletal deformities. Black foot disease is caused by arsenic poisoning. Thus, this statement is also incorrect.

5. **Evaluate Option D**:
- Methylmercury in water does not cause Itai-Itai disease; it is associated with Minamata disease, which is a neurological disorder caused by mercury poisoning. Therefore, this statement is incorrect as well.

6. **Conclusion**:
- The only correct statement is Option A: DDT is a non-biodegradable pollutant.

### Final Answer:
The correct statement pertaining to pollutants is: **DDT (Dichlorodiphenyl trichloroethane) is a non-biodegradable pollutant.**

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