A month after receiving a blood transfusion an immunocompromised male patient develops a fever,

Correct Answer: C

Rationale: A month after receiving a blood transfusion, the development of a fever in an immunocompromised patient can be indicative of graft-versus-host disease (GVHD). GVHD is a condition where the donor immune cells attack the recipient's tissues, manifesting as fever, rash, liver dysfunction, and gastrointestinal symptoms. It typically occurs a few weeks to several months after a blood transfusion, especially in immunocompromised individuals. An allergic response to medication or myelosuppression would typically present earlier after the transfusion, while nothing related to the blood transfusion does not explain the fever in this context.

Correct Answer: D

Rationale: Montelukast is a medication commonly used to treat asthma and allergic rhinitis. Its therapeutic effects include decreased frequency and severity of acute asthma attacks, decreased severity of allergic rhinitis, and decreased attacks of exercise-induced bronchoconstriction. However, Montelukast is not associated with treating anxiety attacks. Anxiety is a mental health condition that is typically managed with appropriate therapy and medication specifically designed for anxiety disorders.

Correct Answer: A

Rationale: For first-order kinetics, the rate of elimination is directly proportional to plasma drug concentration, ensuring constant percentage clearance over time.

Correct Answer: B

Rationale: Keratolytic drugs, such as salicylic acid, work by softening and removing the horny layer of the epidermis, which consists of dead skin cells. This helps treat conditions like psoriasis, warts, and calluses. They do not target the dermis (A), erythematous lesions (C), or hair follicles (D).

Correct Answer: B

Rationale: Nefopam is contraindicated in epilepsy due to its potential for lowering the seizure threshold.