Which systemic fungicide was first time discovered by Von Schmeling and Kulka

Answer: Option A

Oxathiin systemic fungicide was first time discovered by Von Schmeling and Kulka.
A systemic fungicide is taken up by a plant and is then translocated within the plant system, it can thereby protect the plant from infections and restrict/Control the further growth of existing fungal infections.
Oxathiin is a six-membered, unsaturated heterocycle containing four carbon atoms, one sulphur and one oxygen atom and two double bonds, but especially 1,4-oxathiin.