Which is not a common cause of hypersensitivity pneumonitis?

Correct Answer: D

Rationale: Dust mites are not a common cause of hypersensitivity pneumonitis, unlike moldy hay, bird droppings, humidifiers, and air conditioners.

Correct Answer: B

Rationale: Ignoring the behavior allows the child to outgrow it naturally without drawing unnecessary attention. Reassurance and encouragement are also helpful but ignoring avoids reinforcing the habit.

Correct Answer: A

Rationale: Squatting helps increase systemic vascular resistance, reducing the right-to-left shunt and improving oxygenation in Tetralogy of Fallot.

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: A

Rationale: Administering vitamin K at birth prevents hemorrhagic disease of the newborn