A 20-year old male presents with a three- day history of an acute generalized gingivitis. He has malaise, fever and bilateral cervical lymphadenopathy. A
blood examination reveals

Hb: 8.9g/100ml
Platelets: 82,000/mm^3
Red blood cell count: 3,900,000/mm^3
White blood cell count: 870,000/mm^3

Normal Values:
Hb: 14-18g/100ml
Platelets: 150,000-400,000/mm^3
Red blood cell count: 4-5million/mm^3
White blood cell count: 5,000-10,000/mm^3
The most likely diagnosis is

infectious mononucleosis.

thrombocytopenic purpura.

acute myelogenous leukemia.

acute necrotizing ulcerative gingivitis.