Short answer
| Poison Extract | Pulp (Red) | Angel Leaf | Pulp (Red) |
Long answer
You need to solve two riddles of the Old witch:
the first is poison extract
| Pulp (Green) | Mushroom | Mushroom | Pulp (Green) |
while the third is antitoxin
| Poison Extract | Pulp (Red) | Angel Leaf | Pulp (Red) |