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: Pediatrics
Hirschsprung disease is confirmed by ? 
Select and explain. 
A. Rectal biopsy, B. Per/Rectal examination, C. Rectal manometry, D. X-ray abdomen
A: Rectal biopsy
Answer: A: Rectal biopsy 
Explanation: Ans. is 'a' i.e., Rectal biopsyo Rectal suction biopsy is procedure of choice.