A student performed four biological molecule tests on a milk sample. The tests and outcomes were: heating to $80^{\circ}\text{C}$ with Benedict’s solution produced a green colour; adding Biuret solution produced a purple colour; adding iodine solution produced an orange colour; boiling with acid, then neutralising, and afterwards heating to $80^{\circ}\text{C}$ with Benedict’s solution produced a brick red colour. Which conclusion drawn from these results is correct?
- Aonly protein and reducing sugar present
- Bonly protein and non-reducing sugar present
- Conly protein, reducing sugar and non-reducing sugar present
- Donly starch, protein and sugar present