In Tetralogy of Fallot all are true Except:

Correct Answer: D

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

Correct Answer: B

Rationale: Aplastic anemia results from bone marrow failure, leading to pancytopenia, including decreased megakaryocytes, which causes thrombocytopenia. Other causes, such as ITP and hypersplenism, typically have normal or increased megakaryocytes.

Correct Answer: A

Rationale: Allergic conjunctivitis is the most frequent hypersensitivity response in the eye, triggered by environmental allergens and mediated by IgE.

Correct Answer: B

Rationale: Doxorubicin is a chemotherapeutic agent known for its dose-dependent cardiotoxicity, leading to dilated cardiomyopathy due to mitochondrial dysfunction and oxidative stress in cardiac myocytes.

Correct Answer: C

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