This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nose and PNS, Subject name: ENT
A 4-year-old child presents with bleeding from right side of nose. He also gets purulent discharge from the same side. The likely diagnosis is: 
Select and explain. 
A. Septal deviation with right maxillary sinusitis, B. Unilateral channel atresia, C. Antrochoanal polyp, D. Foreign body
D: Foreign body
Answer: D: Foreign body 
Explanation: Unilateral purulent nasal discharge and bleeding from the nose in a child indicate a foreign body.In antrochoanal polyp and unilateral choanal atresia, the epistaxis is absent. Similarly unilateral maxillary sinusitis can cause purulent discharge but no significant bleeding.