Answer the following Q with stream of consciousness. Context: An electric current is a flow of electric charge. In electric circuits this charge is often carried by moving electrons in a wire. It can also be carried by ions in an electrolyte, or by both ions and electrons such as in an ionised gas (plasma).

Question: a flow of charge can be caused by ions moving in a?

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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To answer this question, we should know that: It can also be carried by ions in an electrolyte, or by both ions and electrons such as in an ionised gas (plasma). Therefore, the final answer is an electrolyte.