Hi Anindita,
You asked about DRAFT : BREEZE in the math forum, so I'm bringing the discussion over here to the verbal forum.
As for the particular question you cited, I looked it up, and you're right, there is a typo which I have reported. The correct answer explanation should say:
(A) CORRECT. A houseplant is an indoor version of a bush.
As for the relationship between a draft and a breeze, my first thought is that a draft is unwanted and a breeze is nice (a "draft" can only happen in a building, and you only call it a draft when you don't like it).
If I were seeing this question for the first time, I'd expect an answer like WEED : PLANT or WEED : CROP or something (I can't think of a word for a "nice plant" specifically, but a "weed" is a plant you don't like, so it's a pretty good analog for a "draft"! That is, there is no such thing as a draft or a weed in nature -- it all depends on your negative opinion of a particular gust of wind or plant).
But as it turns out, there is nothing like weed: plant in the choices, so I had to rethink -- and it makes sense that the correct relationship is "a draft is an indoor breeze."
Sometimes we think of a perfectly good relationship, don't get any right answers, and then have to go back and try to think of another perfectly good relationship for the same stem pair.
Jen