Although Found in Most Chronic Myeloproliferative Disorders,increased Fibrosis Detected by the Silver

Although found in most chronic myeloproliferative disorders,increased fibrosis detected by the silver techniques and trichrome stain is the key feature of

A) secondary polycythemia.
B) chronic myelogenous leukemia.
C) essential thrombocythemia.
D) primary myelofibrosis.