The most common symptom of peptic ulcers is:

A. A 69-year-old female with anemia secondary to insufficient erythropoietin production: While anemia can occur due to chronic kidney disease, it does not directly cause urinary tract obstruction. The lack of erythropoietin affects red blood cell production, not urine flow.

B. A 70-year-old male with benign prostatic hyperplasia (BPH): BPH is a common cause of urinary obstruction in older men. The enlarged prostate compresses the urethra, leading to impaired urine outflow and increased risk of urinary retention.

C. A 58-year-old male with renal calculi: Kidney stones are a frequent cause of urinary tract obstruction. They can block the flow of urine in the ureters, renal pelvis, or bladder, leading to pain, hydronephrosis, and infection risk.

D. A 29-year-old female, pregnant for the first time: Pregnancy can cause urinary obstruction due to the enlarged uterus compressing the ureters, especially in the second and third trimesters, resulting in reduced urine flow and potential hydronephrosis.

E. A 28-year-old male with a neurogenic bladder secondary to spinal cord injury: Neurogenic bladder disrupts normal bladder function and control, which can lead to urinary retention and obstruction due to poor coordination of bladder muscle and sphincter activity.

F. A 43-year-old male with an acid-base imbalance secondary to malnutrition: While malnutrition can affect many organ systems, acid-base imbalance by itself is not a direct cause of urinary tract obstruction.

A. Primary disorders affect hormone receptors, while secondary disorders affect hormone production: While receptor sensitivity may play a role in some conditions, the main distinction between primary and secondary endocrine disorders is based on the location of dysfunction, not receptor or hormone function alone.

B. Primary disorders originate in the target organ, while secondary disorders originate in the pituitary gland or hypothalamus: In primary disorders, the problem lies in the endocrine gland itself (e.g., the thyroid gland in primary hypothyroidism), while secondary disorders result from dysfunction in regulatory centers like the pituitary or hypothalamus.

C. Primary disorders involve the hypothalamus, while secondary disorders involve the target organ: This reverses the correct relationship. Secondary disorders typically involve the hypothalamus or pituitary, not primary disorders.

D. Primary disorders are caused by external factors, while secondary disorders are caused by genetic mutations: While both external and genetic factors can contribute to endocrine disorders, this distinction does not define the difference between primary and secondary types. The classification is based on the anatomical source of dysfunction.