Tick the drug belongs to antibiotics-cephalosporins:

Correct Answer: B

Rationale: The correct answer is B: Cefaclor. Cefaclor belongs to the cephalosporin class of antibiotics, specifically a second-generation cephalosporin. Cephalosporins are beta-lactam antibiotics that inhibit bacterial cell wall synthesis. Streptomycin (A) is an aminoglycoside antibiotic, Phenoxymethylpenicillin (C) is a penicillin antibiotic, and Erythromycin (D) is a macrolide antibiotic. These choices do not belong to the cephalosporin class.

Correct Answer: A

Rationale: Niclosamide inhibits oxidative phosphorylation by blocking the electron transport chain in helminthes. It disrupts their energy production, leading to paralysis and death. Piperazine acts on GABA receptors, Praziquantel disrupts the parasite's tegument, and Mebendazole inhibits microtubule function. Therefore, Niclosamide is the correct choice for inhibiting oxidative phosphorylation in helminthes.

Correct Answer: A

Rationale: Flutamide is the correct answer as it is a known antiandrogen drug used to treat conditions like prostate cancer. It works by blocking the action of androgens in the body. Aminoglutethimide is not an antiandrogen but an aromatase inhibitor. Tamoxifen is a selective estrogen receptor modulator used in breast cancer treatment. Testosterone is a natural male hormone and not an antiandrogen. Therefore, Flutamide is the correct choice for an antiandrogen drug.

Correct Answer: B

Rationale: The correct answer is B: Niacin. Niacin can cause hepatotoxicity and exacerbate liver conditions, which would be a concern in this patient. Cholestyramine (A) works in the intestines, Ezetimibe (C) inhibits cholesterol absorption, and Lovastatin (D) inhibits cholesterol synthesis in the liver, none of which are contraindicated in liver conditions.

Correct Answer: C

Rationale: The correct answer is C: Plasminogen activator. Plasminogen activator is responsible for converting plasminogen into active plasmin, which is an essential enzyme in the fibrinolysis process. Plasminase (A) and Plasminogenase (B) are not actual enzymes involved in this conversion. Plasminogen activator inhibitor (D) works to regulate the activity of plasminogen activator, rather than directly converting plasminogen into plasmin.