Oligoarthritis predominantly affects the joints of the lower extremities rather than upper extremity joints. Which of the following joints is never a presenting sign of oligoarthritis?

Correct Answer: D

Rationale: Interphalangeal joints are rarely affected in oligoarticular JIA.

Correct Answer: B

Rationale: Succinylcholine is associated with malignant hyperthermia, a life-threatening reaction with symptoms such as muscle rigidity and high fever.

Correct Answer: A

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

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: C

Rationale: Aspirin is used primarily for arthritis in RF but is not a first-line treatment for severe carditis with CHF.