The term "mitochondria" was coined by Carl Benda in 1898. Mitochondria are organelles found in most eukaryotic cells that are responsible for generating ATP, the primary energy source used by cells. Benda named them "mitochondria" based on their thread-like shape and his observation that they were stained with basic dyes. Prior to the term "mitochondria," Richard Altman had described similar organelles in 1890 and referred to them as "bioblasts." Therefore, the correct answer to the question is Carl Benda.