Pyorrhoea is a disease of the A. nose B. gums C. heart D. lungs

nose
gums
heart
lungs

The correct answer is B. gums.

Pyorrhoea is a disease of the gums that is caused by bacterial infection. It is characterized by inflammation, redness, and bleeding of the gums. If left untreated, pyorrhoea can lead to tooth loss.

The other options are incorrect. A. nose: The nose is a respiratory organ. It is not affected by pyorrhoea. B. heart: The heart is a muscular organ that pumps blood throughout the body. It is not affected by pyorrhoea. C. lungs: The lungs are respiratory organs. They are not affected by pyorrhoea.