(Medicaid benefit application case; value of plaintiff's farmland properly not counted as an available resource because plaintiff used the farmland in the course of plaintiff's business and it produced an annual return consistent with its fair market value; regulation at issue (13 C.S.R. Sec. 40-2.030(8)(B)) [Missouri Code of State Regulations] did not require plaintiff to personally work the farm or physically use the land, but merely profit from the land personally; no cap on exemption for business property under 42 U.S.C. Sec. 1382b(a)(3)).