This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nose and paranasal sinuses, Subject name: ENT
A child presented with a history of unilateral purulent nasal discharge with occasional bloody discharge from the same side, The diagnosis is? 
Select and explain. 
A. Antrochoanal polyp, B. Foreign body, C. Angiofibroma, D. Rhinosporidiosis
B: Foreign body
Answer: B: Foreign body 
Explanation: In case of foreign body in the nasal cavity, the child presents with unilateral nasal discharge which is often foul smelling and occasionally bloodstained. It is a dictum that "if a child presents with unilateral, foul-smelling, nasal discharge, the foreign body must be excluded. If it is radiopaque,a radiograph of the nose is useful to confirm Ref: Dhingra 7e pg 181.