Importing "Aiken" format files

The Aiken format is a very simple way of creating multiple choice questions using a clear human-readable format. Here is an example of the format:

    What is the correct answer to this question?
    A. Is it this one?
    B. Maybe this answer?
    C. Possibly this one?
    D. Must be this one!
    ANSWER: D

    Which LMS has the most quiz import formats?
    A) Moodle
    B) ATutor
    C) Claroline
    D) Blackboard
    E) WebCT
    F) Ilias
    ANSWER: A

The question must be all on one line.

Each answer must start with a single-letter character, followed by a period '.' or a bracket ')', then a space.

The answer line must immediately follow, starting with "ANSWER:" and then giving the appropriate letter.