Definition: Based on the given context, craft a common-sense question, especially those that are LONG, INTERESTING, and COMPLEX. The goal is to write questions that are easy for humans and hard for AI machines! To create such questions, here are some suggestions: A. What may (or may not) be the plausible reason for an event? B. What may (or may not) happen before (or after, or during) an event? C. What may (or may not) be a plausible fact about someone (or something)? D. What may (or may not) happen if an event happens (or did not happen)? You can also create other types of questions. DO NOT make your question answerable without looking at the context, or question of which the correct answer can be directly extracted from the context. DO NOT ask a question that requires very specialized knowledge that is not common sense. DO NOT ask too simple or too short questions. Your question must be related to the context and answerable with common sense. Try to add more variations and complexity to the questions.
Input: Context: A couple months ago , I purchased a 12 year old TB mare from my old English teacher . She was lame at the time , but only a bit gimpy and the owner convinced me it was a stone bruise . I had my vet look at her , and it was , indeed , a stone bruise . Now a few months ( and probably a little over $ 1000 of xrays , joint supplements and everything later ) we ' ve come to find out she has navicular .

Why did they go to the vet ?