70.犬隻胸腔內臟器發炎或發生腫瘤,會導致下列何種骨頭病變?(A)骨肉瘤(osteosarcoma)(B)肥大性骨關節病(hypertrophic osteopathy)(C)骨質石化症(osteopetrosis)(D)骨軟骨病(osteochondrosis)