<prompt> Most common cause of UL mucopurulent rhinorrhea in a child is:Foreign bodyAdenoids which are blocking the airwaysDeted nasal septumInadequately treated acute frontal sinusitis  <response>: A unilateral nasal discharge is nearly always due to foreign body and if duscharge has an unpleasant smell,it is pathognic. If a child presents with unilateral,foul smeling nasal discharge,foreign body must be excluded. Ref Dhingra 6e,p 161. 