A 7-year-old child frequently argues with adults, refuses to…

A 7-year-old child frequently argues with adults, refuses to follow rules, deliberately annoys others, and blames others for their mistakes. These behaviors have persisted for over six months and cause significant problems at home and school. Which of the following is the most likely diagnosis? 

A patient with a history of systemic lupus erythematosus (SL…

A patient with a history of systemic lupus erythematosus (SLE) presents with worsening kidney function. Laboratory tests show large amounts of circulating antigen–antibody complexes depositing in the kidneys. Which type of hypersensitivity best explains this mechanism of tissue damage?