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Question

Knock knee syndrome is caused by-


A

Fluoride pollution

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B

Lead pollution

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C

Mercury pollution

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D

Arsenic pollution

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Solution

The correct option is A

Fluoride pollution


The correct option is A.

Explanation of the correct option:

Knock knee:

  1. It is a condition in which the knees bend towards the inside whereas the ankles remain separated.
  2. It is also known as Genu valgum.

Causes of knock knee disease-

  1. Rickets
  2. Benign bone tumor
  3. Injury
  4. Bone infection
  5. Arthritis in the knee
  6. Fluoride poisoning

Fluoride poisoning:

Fluoride poisoning or pollution of fluoride means accumulation of fluoride inside the body which can cause the deficiency of vitamin D and thus, it might lead to knock knee syndrome.

Explanation of the incorrect options:

Option B:

Lead pollution: When an excess amount of lead gets deposited in our body it causes a delay in the growth and development, abdominal pain, neurological changes, etc.

Option C

Mercury pollution: Accumulation of mercury inside the body causes neurological damage, impaired motor skills, and other related issues.

Option D:

Arsenic pollution: Arsenic is extremely harmful to the body, its accumulation in the body mainly affects the liver, lungs, kidneys, and skin, it might also lead to coma or death.

Final answer: Knock knee syndrome is caused by fluoride pollution.


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