Present opinion is that solitary thyroid nodules that do not take up iodine are:

Correct Answer: D

Rationale: Cold (nonfunctional) thyroid nodules have a higher malignancy risk and often warrant surgical removal.

Correct Answer: B

Rationale: Renal failure (shutdown) increases phosphorus due to reduced excretion.

Correct Answer: A

Rationale: Wilson's disease impairs liver function, altering liver chemistries.

Correct Answer: A

Rationale: Hypothyroidism causes brittle hair, large tongue, pericardial effusion, and slow DTR relaxation.

Correct Answer: D

Rationale: Glucagon has no direct chronotropic effect on the heart; it promotes glycogenolysis, gluconeogenesis, and insulin release.