A 1-year-old infant is known to have heart disease & is noted to be cyanosed. Which of the following is the most likely diagnosis?

Correct Answer: D

Rationale: Tricuspid atresia leads to severe cyanosis due to lack of right atrioventricular connection, necessitating a right-to-left shunt for survival. It presents early with cyanosis and hypoxia requiring urgent intervention.

Correct Answer: B

Rationale: It is recommended to give a brightly colored toy or rattle to a 2-month-old at around 4 months of age. At this stage, grasping has begun as a deliberate act, and the infant can grasp, hold, and begin shaking objects to produce noise.

Correct Answer: C

Rationale: Distributive shock is caused by vasodilation and fluid maldistribution, as seen in early septic shock, unlike cardiac or hypovolemic causes.

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: C

Rationale: Distributive shock, such as in early septic shock, is caused by widespread vasodilation and decreased systemic vascular resistance.