Suitability: Answer type is appropriate when you want the learner to complete a text (e.g. for a patient education).
There are two possibiliies:
No answer suggestions. Suitable when you want the learner to give answers actively (like freetext).
Advantage: Demands active answers.
Diadvantage: An all-embracing encoding is only possible when there are definite answers with only few synonyms.
Answer suggestions are given in brackets behind. Suitable when you want the learner to fill in the gaps like a MC-question.
Advantage: No problem of encoding.
Disadvantage: Demands only passive knowledge.
Note: For this version it would be more comfortable for the learner to have an Underline Answer where only a click is needed instead of a manual insertion.