Allergic rhinitis may be complicated by secondary bacterial infection as sinusitis. Of the following, the MOST likely clue to infection is

Correct Answer: C

Rationale: Thick nasal secretions, especially yellow or green, suggest bacterial infection, differentiating it from allergic rhinitis, which usually presents with clear nasal discharge.

Correct Answer: D

Rationale: The correct answer is D because the incomplete digestion of solid foods in the stools of a 9-month-old infant is normal due to the immaturity of the digestive tract at this age. It is a common occurrence in infants and does not necessarily indicate a problem.

Correct Answer: C

Rationale: Checking lead levels is important given the association between lead exposure and developmental delays. While physical exams and hearing tests are useful, lead screening addresses potential environmental contributors.

Correct Answer: D

Rationale: Mixed connective tissue disease is characterized by Raynaud's phenomenon, joint pain, and lung involvement, making 'All of the above' the correct answer.

Correct Answer: D

Rationale: Heart failure is not a common feature of TOF due to the obstructed right ventricular outflow, which limits pulmonary overcirculation.