The is the endometrial layer that remains essentially unchanged during the menstrual cycle.

Correct Answer: C

Rationale: Basal layer persists, regenerating functional layer each cycle.

Correct Answer: A

Rationale: Amoebic liver abscesses are typically single, located in the right lobe, and diagnosed effectively with the indirect hemagglutination test for Entamoeba histolytica.

Correct Answer: C

Rationale: Atrial fibrillation in hyperthyroidism is best managed with digitalis to control heart rate and quinidine to restore sinus rhythm, alongside antithyroid drugs for underlying cause.

Correct Answer: D

Rationale: Trousseau's sign (carpopedal spasm) indicates hypocalcemia, typically from hypoparathyroidism or alkalosis.

Correct Answer: C

Rationale: Hyperparathyroidism increases serum calcium, decreases phosphorus, and elevates urinary calcium due to PTH-driven bone resorption and renal effects.