Since this seems to be a school essay prompt, I’ll give some advice on how to approach it. A feature of essay prompts like this, is that there isn’t necessarily a right answer, and in any case the teacher or examiner doesn’t care about the answer. The purpose of the prompt is to give you the chance to show that you know the material in the play (who are the characters? what are they like? what happens to them?) and that you can write about it intelligently and clearly.
So in this case I would start by making a list of the romantic pairings in the play:
Then for each pairing I’d make a list of ways in which the characters are similar and ways in which they are opposite. This is a good time to gather quotes from the play to illustrate the points that you are later going to make in the essay.
For example, let’s take Theseus & Hippolyta. Here are three points where they are similar:
And two points where they are dissimilar:
The evidence in this case seems to be equivocal on the opposites/similarities question. But repeat the exercise for all the other pairings, and maybe something will stand out that you can turn into the thesis of your essay: “Shakespeare favours opposite/similar romantic pairings”. But if nothing stands out then that should be the thesis: “Shakespeare presents a variety of different types of romantic pairing”.