A seven-year-old dog weighing 10.9 kg is presented after the owner caught the dog eating warfarin-containing rat poison the day before. The dog has no overt clinical signs at presentation. Baseline coagulation parameters are normal [Prothrombin time (PT), Activated partial thromboplastin time (aPTT) and Proteins induced by vitamin K1 absence or antagonism (PIVKA)]. The dog is confined to limit exercise and monitored. At 72 hours PT and PIVKA tests are elevated. Which one of the following choices is the most appropriate treatment step?
一只7岁大约10.9kg重的狗由于主人昨天看到他吃了含有华法林的老鼠药前来就诊。该犬目前没有明显的临床症状。基础凝血检查正常（PT，aPTT和PIVKA）。该犬被限制活动并且留观。72小时的时候PT和PIVKA结果延长。以下哪个选项是最合适的下一步治疗方案？
Find out the answer by clicking on one of the listed choices. Good luck!
点击列出的选项找出答案，祝大家好运
A - Oral vitamin K1 口服VK1
B - Plasma transfusion 输血浆
C - Blood transfusion 输全血
D - Subconjunctival apomorphine 黏膜给予阿扑吗啡
E - Activated charcoal 活性炭