A 63 - year old man presented with massive and splenomegaly, lymphadenopathy and a total leucocyte count of 17000 per mm3. The flow cytometery showed CD 23 negative and CD 5 positive monoclonal B-cells with bright kappa positively comprising 80% of the peripheral blood lymphoid cells. The most likely diagnosis is -: (A) Mantle cell lymphoma, (B) Splenic lymphoma with vilious lymphocytes, (C) Follicular lymphoma, (D) Hairy cell leukemia
Answer is A. None