This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
A child develops acute respiratory distress, stridor, hyperinflation on one side of chest with decreased breath sound on that side. Most likely cause is : 
Select and explain. 
A. Asthma, B. Aspiration pneumonia, C. Foreign body aspiration, D. Pleural effusion
C: Foreign body aspiration
Answer: C: Foreign body aspiration 
Explanation: Answer is C (Foreign Body Aspiration): Foreign Body Aspiration is an impoant cause of stridor in. children. Obstruction leads to hyperinflation, chest wall hyperresonance and decreased breath sounds. All the other choices mentioned in the question do not cause stridor.