Query: How to get both Question and multi Answers in one query
You could make it with a simple JOIN, the question is: Are you going to have others tables?. That could make that you have to redo your design. I suggest EAV if you're going to use more tables with some configuration between Questions and Answers. 

With your actual design the query would be like:

mysql&gt; SELECT 
    -&gt; q.QuestionID,
    -&gt; q.QuestionContent,
    -&gt;     a.AnswerID,
    -&gt;     a.ReplyContent
    -&gt; FROM test.Question AS q
    -&gt; JOIN test.Answer AS a ON (a.QuestionID=q.QuestionID)
    -&gt; WHERE q.QuestionID=1;
+------------+------------------------------+----------+--------------+
| QuestionID | QuestionContent              | AnswerID | ReplyContent |
+------------+------------------------------+----------+--------------+
|          1 | How many indexes may I have? |        1 | Use 6        |
|          1 | How many indexes may I have? |        2 | Use 1        |
|          1 | How many indexes may I have? |        3 | A or B       |
+------------+------------------------------+----------+--------------+
3 rows in set (0.00 sec)

mysql&gt; EXPLAIN SELECT 
    -&gt; q.QuestionID,
    -&gt; q.QuestionContent,
    -&gt;     a.AnswerID,
    -&gt;     a.ReplyContent
    -&gt; FROM test.Question AS q
    -&gt; JOIN test.Answer AS a ON (a.QuestionID=q.QuestionID)
    -&gt; WHERE q.QuestionID=1;
+----+-------------+-------+-------+-------------------------+---------+---------+-------+------+-------------+
| id | select_type | table | type  | possible_keys           | key     | key_len | ref   | rows | Extra       |
+----+-------------+-------+-------+-------------------------+---------+---------+-------+------+-------------+
|  1 | SIMPLE      | q     | const | PRIMARY                 | PRIMARY | 4       | const |    1 |             |
|  1 | SIMPLE      | a     | ALL   | fk_Answer_Question1_idx | NULL    | NULL    | NULL  |    3 | Using where |
+----+-------------+-------+-------+-------------------------+---------+---------+-------+------+-------------+
2 rows in set (0.00 sec)

mysql&gt; 


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