Acute ingestion of inorganic mercury salts (typically secondary to ingestion of a button battery) can manifest in a few hours as

Correct Answer: D

Rationale: Corrosive gastroenteritis results from the direct toxic effects of mercury salts on the gastrointestinal lining.

Correct Answer: D

Rationale: The statement 'Isoimmune hemolytic disease may be found in first-born infants irrespective of infant blood group' is incorrect. Isoimmune hemolytic disease typically occurs when maternal antibodies cross the placenta and attack fetal red blood cells. This is more common in subsequent pregnancies due to sensitization during the first pregnancy.

Correct Answer: D

Rationale: Exercise is a less common cause of anaphylaxis compared to foods, drugs, insect stings, and latex.

Correct Answer: C

Rationale: Topical corticosteroids are effective for managing allergic rhinitis symptoms when antihistamines and decongestants fail.

Correct Answer: A

Rationale: Polymyositis is primarily characterized by muscle weakness without the rash seen in dermatomyositis.