This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Disorders of Gastrointestinal System Including Diarrhea, Subject name: Pediatrics
A 10-year-old child presents with fever since 24 hours. History reveals 3 episodes of chest infection and passage of bulky, foul smelling stools. The most probable diagnosis is? 
Select and explain. 
A. Cystic fibrosis, B. Maple syrup urine disease, C. Bilirubin conjugation defect, D. Crigler-Najjar syndrome
A: Cystic fibrosis
Answer: A: Cystic fibrosis 
Explanation: Recurrent chest infections & bulky, foul smelling stools point to a diagnosis of cystic fibrosis