The correct answer is true.
It is true that waiting 10 minute in between repetition session is the best way to learn through repetition.
Repetition is the path to mastery. If you practice one thing over and over in a correct way, you can dominate the topic at hand. But one important thing when doing repetition session is to wait 10 minutes before the next repetition session. This allows the brain to absorb and comprehend the information in order to understand the concept. It is better for the brain to do this than keep filling it with permanent influx of information.