A male patient 59 year old complains of multiple swellings in the neck, fever, and weight loss since 6 months. Patient is a known hypertensive and is on medication for the same. General examination reveals painless lymph node enlargement in the neck and on blood investigation, anemia is revealed. Lymph node biopsy shows cells that have a delicate multilobed, puffy nucleus resembling popped corn. Which variant of lymphoma is this?