In 1873, Camillo Golgi discovered Golgi apparatus in Purkinje cells (nerve cells)

Q. In 1873, Camillo Golgi discovered Golgi apparatus in Purkinje cells (nerve cells).
Which is the stain that he used to visualise Golgi apparatus?
A. Janus green
B. Silver stain
C. Orange G
D. Haematoxylin
Answer: Silver stain