[Solved] An explorer found a silver coin marked 7 BC. He was told it was a forgery. Why?

This riddle has been around for some time on internet platforms such as Instagram, Facebook, and WhatsApp, and many people still argue over what the answer might be, as there are many possibilities. The correct answer is The label BC only could have come into usage after 0 BC. BC means Before Christ. Nobody would have known who Christ was 7 years before he was born.