Correct Answer: C

Rationale: Tetanus toxoid provides long-lasting active immunity. When a person is vaccinated with tetanus toxoid, their immune system is stimulated to produce antibodies against the tetanus toxin. These antibodies provide protection against tetanus infection by recognizing and neutralizing the toxin if the person is exposed to the bacteria that causes tetanus in the future. This active immune response can last for many years, providing ongoing protection against tetanus. However, booster doses are recommended every 10 years to maintain adequate levels of protection.

Correct Answer: B

Rationale: When managing a conscious patient with a foreign object lodged in the eye, the appropriate action is to rinse the eye with sterile saline solution. This helps to flush out the foreign object and reduce the risk of further injury or infection. Attempting to remove the object with tweezers or applying pressure to the eyelid can potentially cause more harm to the eye. Placing a bandage over the affected eye is not beneficial in this situation as it does not address the presence of the foreign object. Rinsing the eye with sterile saline solution is the safest and most effective initial step to take in managing a foreign object lodged in the eye.

Correct Answer: A

Rationale: The most significant contributory factor to the development of lung cancer is being a cigarette smoker. Cigarette smoking is directly linked to approximately 85% of lung cancer cases. The harmful substances in tobacco smoke, such as carcinogens, damage the cells in the lungs, leading to the development of cancer over time. Smokers are at a significantly higher risk of developing lung cancer compared to non-smokers. Therefore, being a cigarette smoker is the primary and most influential risk factor for developing lung cancer.

Correct Answer: C

Rationale: The symptoms of polyuria (excessive urination), polydipsia (excessive thirst), and polyphagia (excessive hunger) are classic signs of diabetes mellitus. In this case, the presence of hyperglycemia (high blood sugar) and glycosuria (glucose in the urine) further support the diagnosis of diabetes mellitus. Insulin deficiency or resistance in diabetes leads to impaired glucose utilization and excessive glucose in the bloodstream, causing the classic symptoms observed in the patient. Hyperthyroidism, hypothyroidism, and Cushing's syndrome do not typically present with the hallmark symptoms of polyuria, polydipsia, and polyphagia associated with uncontrolled diabetes mellitus.

Correct Answer: B

Rationale: Uterine atony is caused by the markedly distended uterus and intermittent uterine contractions within 2 to 3 days after birth. It is characterized by the inability of the uterus to contract after delivery, leading to excessive bleeding postpartum. This condition is a significant risk factor for postpartum hemorrhage. Treatment may involve massage of the uterus, administration of uterotonics, and in severe cases, surgical interventions such as a hysterectomy. Retained placenta refers to incomplete expulsion of the placenta after delivery. Afterpains are the discomfort felt by some women as their uterus contracts and returns to its normal size after childbirth. A boggy uterus is another term for a uterus that feels soft, lax, or lack firm tone, which can be a sign of uterine atony.