Provide your best answer for the following question. Give ONLY the answer, no other words or explanation.
For example:

Answer: <most likely answer, as short as possible; not a complete sentence, just the answer!>.

The question is: Scientists Stanley Miller and Harold Urey sealed water, methane, ammonia, and hydrogen in a flask, to simulate Earth's early environment. They exposed the chemicals to electric charges to simulate lighting. What did the process produce?
amino acids
Organic compounds, including amino acids.