3.一位50歲女性被診斷有portal vein thrombosis。周邊血液檢查發現有JAK2基因突變，此病人最可能有下列何種疾病？(A)Myeloproliferative neoplasm(B)Paroxysmal nocturnal hemoglobinuria(C)Protein S deficiency(D)Protein C deficiency(E)Antithrombin III deficiency