Tick the antiviral drug which belongs to endogenous proteins:

Correct Answer: C

Rationale: Interferon alfa is the correct answer as it is an endogenous protein produced by the immune system in response to viral infections. It helps to inhibit viral replication and spread. Amantadine is a synthetic antiviral drug that works by blocking viral replication. Saquinavir is a protease inhibitor used to treat HIV. Pencyclovir is an antiviral drug used to treat herpes infections. Therefore, choices A, B, and D are incorrect as they are synthetic antiviral drugs, while choice C is correct as it is an endogenous protein with antiviral properties.

Correct Answer: C

Rationale: The correct answer is C: Quinidine. Quinidine is contraindicated due to its potential to prolong the QT interval, leading to serious arrhythmias like Torsades de Pointes. Mexiletine and Lidocaine are sodium channel blockers with lower risk of QT prolongation. Phenytoin is an anti-seizure drug and does not typically impact cardiac conduction. Therefore, Quinidine is the absolute contraindication for this patient.

Correct Answer: B

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.

Correct Answer: A

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.

Correct Answer: D

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.