A 56 Year Old Man Noticed Increased Fatigue,night Sweats,and Enlarged

A 56 year old man noticed increased fatigue,night sweats,and enlarged lymph nodes in his right axilla.He consulted his physician,a biopsy was done,and a representative section from the biopsy is shown in the accompanying photomicrograph.The right panels show staining for Bcl-2,with a normal lymph node shown in the bottom panel (GC = germinal centre,MZ = mantle zone) .Which one of the following is the best diagnosis?

A) Diffuse large B cell lymphoma
B) Follicular hyperplasia
C) Follicular lymphoma
D) Hodgkin's lymphoma
E) Metastatic carcinoma