This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: New born infants, Subject name: Pediatrics
[{'content': 'Most common cause of Per Rectal Bleeding in Infant ? \nSelect and explain. \nA. Anal fissure, B. Rectal polyp, C. Intussusception, D. Hypeension', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Anal fissures: These small tears are the most common cause of rectal bleeding in children. They can hapen when passing a large or hard stool, which stretches the lining of the anus until it tears, or when frequent diarrhea irritates the lining . Reference : page 126 Ghai Essential Pediatrics 8th edition', 'role': 'assistant'}]