The following possibilities exist in order to type your answer comments:
Explaining the correct answer and the reasoning behind it is especially important, so that the students understand how and why this particular solution is correct. The answer comment should illustrate which considerations brought you to your expert solution. You should also indicate if specialty knowledge was used in solving the problem. It is also very helpful to refer to literature or even provide direct hyperlinks to online sources.
More information about didactic advice can be found here.
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