options: f : why not have a birthday party for me ? f : i know lydia like doing some exercise . f : a birthday cake is a good choice for celebrating her high marks of mathematics exams . f : that 's a good idea . i 'll order a birthday cake as a gift for her .
article: f : what are we going to get for lydia 's birthday ? m : how about a pair of running shoes ? f : you know she hates doing exercise . m : then i guess we can buy her a birthday cake ?