Staphylococcus infection can lead to a serious health problem.

Pneumococcal infections are a serious health problem.

A dermatologist works to maintain the health of the skin.

A pneumologist specializes in respiratory system diseases.

I work in the field of neurology.

I work in the cardiology department.

Joint-stock companies are organizations that raise capital with shares.

Indeed, we have to admit that he is right about this.

I can't accept this attractive offer.

Contrary to his claim, the actual situation was different.