Samples of biological molecules are examined for sugars. The table gives the conditions used and the outcomes after each test. Solution 1: heated with Benedict’s solution → blue; boiled with hydrochloric acid, neutralised, then heated with Benedict’s solution → yellow. Solution 2: heated with Benedict’s solution → green; boiled with hydrochloric acid, neutralised, then heated with Benedict’s solution → orange. Solution 3: heated with Benedict’s solution → orange; boiled with hydrochloric acid, neutralised, then heated with Benedict’s solution → red. Which may contain reducing sugars?
- A1, 2 and 3
- B1 and 3 only
- C2 and 3 only
- D1 only