Problem: A child is 4 months old. She fell ill abruptly, temperature elevated up to 37.8°?, cough appeared. On the 3rd day cough became more intensive, dyspnea appeared, at percussion - tympanic sound above lungs, at auscultation - abundant quantity of bubbling, crackles and dry whistling rales. What is your preliminary diagnosis? Choose one: Croupous pneumonia Acute bronchiolitis Acute simple bronchitis Acute obstructive bronchitis Focal pneumonia