Which scientist won the Nobel Prize in 1915 for describing the nature of the structure of chlorophyll in plants and also noted magnesium as the central element in its structure?

Which scientist won the Nobel Prize in 1915 for describing the nature

1.	Which scientist won the Nobel Prize in 1915 for describing the nature of the structure of chlorophyll in plants and also noted magnesium as the central element in its structure?
A.	James Watson
B.	Werner Heisenberg
C.	Hermann Muller
D.	Richard Willstätter
Answer» E.