81. 65 歲男性急性心肌梗塞(acute myocardial infraction) 發生6個月後，病人逐漸發生心臟擴大及出現鬱血性心臟衰竭症(congestive heart failure)，此時心肌病灶中最具代表性的組織變化是： (A) Coagulative necrosis with neutrophil infiltration (B) Fibrovascular granulation tissue (C) Collagenous scar (D) Viable myocytes with waviness of fibers