In Able Supply Co. v. Moye, 898 S.W.2d 766, 768 (Tex. 1995), the supreme court held that a trial court abused its discretion in denying the defendants' motion to compel a supplemental answer to the response, "The answer to this interrogatory has not been determined at this time, but will be supplemented at a later date." Id. Because the case had been on file for several years and many of the defendants had not discovered whether their products were responsible for any of the plaintiffs' injuries, the court found this response inadequate, and held that "each defendant is entitled to discover whether there has been a medical determination that an illness has been caused by that defendant's product." Id. at 770.