The Metal Men are a group of superheroes that appear in DC Comics. The characters first appeared in "Showcase" #37 and were created by writer Robert Kanigher and penciller Ross Andru. Debuting in the Silver Age of Comic Books, the characters have appeared in comic books and other "DC Comics"-related products such as animated television series, clothing, figurines and trading cards.
Can we infer the following?
Robert Kanigher is the only person to have written a Metal Men comic book.

Choose your answer from:
[I] Yes;
[II] It's impossible to say;
[III] No;
The answer is:
[II]