Knocks knee disease is

Options

A. caused by homonal imbalance and excess of HG
B. due to deficiency of tyrosine
C. due to excess fluoride concentration in water
D. due to high BOD and high temperature of water by thermal pollution

Answer

**Step-by-Step Solution:**

1. **Understanding Knock Knee Disease:**
- Knock knee disease, also known as "knock knee syndrome," is a condition where the knees touch each other when a person stands straight, while the ankles remain apart. This results in a characteristic bending of the knees.

2. **Alternative Names:**
- The condition is also referred to as "rickets" or "genu valgum." Rickets is a disease often associated with vitamin D deficiency, leading to weak or soft bones in children.

3. **Causes of Knock Knee Disease:**
- The primary cause of knock knee disease is the excess concentration of fluoride in drinking water. High fluoride levels can lead to various health issues, including skeletal deformities.
- Water pollution, particularly due to high fluoride content, is a significant factor contributing to the development of knock knee syndrome.

4. **Symptoms:**
- In patients with knock knee disease, the knees are bent inward and touch each other, while the rest of the legs remain straight. This abnormal alignment can lead to discomfort and mobility issues.

5. **Misconceptions:**
- It is important to note that hormonal imbalances, tyrosine deficiency, or high biological oxygen demand (BOD) due to thermal pollution are not associated with knock knee disease. These factors do not contribute to the condition.

6. **Conclusion:**
- The correct understanding of knock knee disease is that it is primarily caused by excessive fluoride in water, leading to the characteristic bending of the knees while the rest of the legs remain straight.