Which element has the chemical symbol 'O'?

The chemical symbol 'O' represents Oxygen, which is a vital element for life on Earth. Oxygen is a colorless, odorless gas that makes up about 21% of the Earth's atmosphere, and it plays a crucial role in respiration for many living organisms. It is a member of the chalcogen group in the periodic table and is essential for combustion processes as well.

Osmium is represented by the symbol 'Os,' which is not the correct choice here. Gold is symbolized by 'Au,' derived from its Latin name 'Aurum.' Oganesson, a synthetic element, is denoted by 'Og.' Therefore, Oxygen stands out as the only element among the provided choices that correctly matches the symbol 'O.'