question: Q:A 5-month-old boy is brought to the physician because of fever and a cough for 3 days. His mother reports that he has had multiple episodes of loose stools over the past 3 months. He has been treated for otitis media 4 times and bronchiolitis 3 times during the past 3 months. He was born at 37 weeks' gestation and the neonatal period was uncomplicated. He is at the 10th percentile for height and 3rd percentile for weight. His temperature is 38.3°C (100.9°F), pulse is 126/min, and respirations are 35/min. Examination shows an erythematous scaly rash over the trunk and extremities. There are white patches on the tongue and buccal mucosa that bleed when scraped. Inspiratory crackles are heard in the right lung base. An x-ray of the chest shows an infiltrate in the right lower lobe and an absent thymic shadow. Which of the following is the most likely diagnosis?? 
  {'A': 'Wiskott-Aldrich syndrome', 'B': 'Severe combined immunodeficiency', 'C': 'Leukocyte adhesion deficiency', 'D': 'Chronic granulomatous disease', 'E': 'X-linked agammaglobulinemia'},