<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 7-year-old boy with a sore throat, fever, and generalized malaise is admitted to the pediatric floor. On physical examination, he has diffuse white exudate on both tonsils, and also a palpable spleen with mild hepatomegaly. His blood smear shows large and abundant lymphocytes with blue-gray cytoplasm, irregular nuclei, and dark chromatin with inconspicuous nucleoli. Which of the following is the most likely diagnosis?? A: Infectious mononucleosis, B: Cytomegalovirus infection, C: Toxoplasmosis, D: Graves disease, E: Viral hepatitis,  <response>: This is a clinical vignette describing a 7-year-old boy with symptoms of sore throat, fever, malaise, tonsillar exudates, splenomegaly, and lymphocytosis on blood smear. The description of the lymphocytes is classic for infectious mononucleosis. The enlarged spleen and liver are also typical findings. The differential diagnosis includes other viral infections like CMV and EBV as well as toxoplasmosis, but the lymphocytosis and lymphocyte morphology point specifically to infectious mononucleosis as the most likely diagnosis.A: Infectious mononucleosis 