The recommended children's dosage of Keflex is 25 to 50 mg/kg/day in divided doses. The maximum daily safe dosage for a child weighing 42 lb is: Round to the nearest tenth.

(Number Only, do not enter mg, kg, or day with your answer)

The correct answer is choice C. Sparse hair.

Choice A rationale:

Sleepiness is not a typical symptom of hypothyroidism. Hypothyroidism, a condition where the thyroid gland doesn't produce enough thyroid hormone, leads to a slower metabolism which can cause fatigue, but not necessarily sleepiness.

Choice B rationale:

Weight loss is not associated with hypothyroidism. In fact, weight gain is a common symptom due to the reduced metabolic rate caused by insufficient thyroid hormone levels.

Choice C rationale:

Sparse hair is a characteristic symptom of hypothyroidism. The thyroid hormones play a crucial role in the growth and maintenance of hair follicles. In hypothyroidism, hair can become brittle, thin, and sparse.

Choice D rationale:

Diarrhea is not a typical symptom of hypothyroidism. Constipation, on the other hand, is more commonly associated with this condition due to the slowed digestive processes caused by low thyroid hormone levels.

Choice E rationale:

Puffiness around the eyes is not typically associated with hypothyroidism. However, it is a symptom of another thyroid disorder known as Graves' disease, which is characterized by hyperthyroidism (overactive thyroid).

The correct answer is Choice C: Epispadias.

Choice A rationale:

Chordee is not the correct term to identify when the meatal opening is located on the dorsal surface of the penis. Chordee refers to the downward curvature or bending of the penis, often associated with hypospadias or other congenital conditions.

Choice B rationale:

Hypospadias is not the correct term for this condition. Hypospadias refers to a congenital condition where the opening of the urethra is located on the underside of the penis rather than at the tip. It is not related to the meatal opening being on the dorsal surface.

Choice C rationale:

Epispadias. This is the correct choice. Epispadias is a congenital malformation where the meatal opening is located on the dorsal (upper) surface of the penis. It is a rare condition and requires surgical intervention for correction.

Choice D rationale:

Phimosis is not the correct term for this condition. Phimosis refers to the tightness of the foreskin that prevents it from being pulled back over the tip of the penis. It does not relate to the positioning of the meatal opening.