Some people who use statin drugs to lower their blood cholesterol also take ‘coenzyme $\text{Q}_{10}$’. The diagram shows a simplified structure of one form of this coenzyme. Which row correctly identifies this structure?
- Aan aldehyde; $n + 2$
- Ban aldehyde; $n + 4$
- Ca ketone; $n + 2$
- Da ketone; $n + 4$