A 48 years old woman was admitted with a history of weakness for two months.On examination cervical lymph nodes were found enlarged and spleen was palpable 2 cm below the costal margin.Her hemoglobin was 10.5 g/dl, platelet count 237 x 109/L and total leukocyte count 40 x 109/L, within included 80% mature lymphoid cells with coarse clumped chromatin.Bone marrow revealed a nodular lymphoid infiltrate.The peripheral blood lymphoid cells were positive for CD 19, CD 5, CD 20 and CD 23 and were negative for CD 79 B and FMC - 7 .What is the most likely diagnosis -C

• A. T - cell rich B - cell lymphoma with leukemic spill over the blood
• B. Chronic lymphocytic leukemia
• C. Mantle cell lymphoma
• D. A definite diagnosis can not be made in this patient ithout lymph node biopsy