61.動物經免疫注射數週後,可採集血液標本測試,待抗體量到達預定目標後,最常用何種方法純化其血清抗體? (A)液相萃取(liquid-liquid extraction) (B)離子交換層析法(ion chromatography) (C)親和力層析(affinity chromatography) (D)電泳法(electrophoresis)