Correct Answer: C

Rationale: An 18-month-old child should have approximately 12 teeth. In general, children begin dentition around 6 months of age. During the first 2 years of life, a quick guide to the number of teeth a child should have is as follows: Subtract the number 6 from the number of months in the age of the child. In this example, the child is 18 months old, so the formula is 18 - 6 = 12. The correct answer is 12. Choice A (6) is incorrect as it does not consider the child's age. Choices B (8) and D (16) are incorrect as they do not align with the dental development timeline and the specific age of the child in question.

Correct Answer: B

Rationale: The nurse should begin by asking the client about her menstrual history as it is usually nonthreatening. This information can provide insights into the client's reproductive health and any irregularities. Menstrual history is a common starting point for gynecological assessments and can help in understanding the client's overall health status. Asking about sexual history may be more sensitive and personal, not always appropriate to start with. Obstetrical history pertains to pregnancies and may not be relevant if the client has not been pregnant. Inquiring about the presence of vaginal drainage is important but is usually addressed after gathering more general information about the client's health.

Correct Answer: D

Rationale: The correct answer is the vaginal sponge. The vaginal sponge, when used with foam or jelly contraception, acts as a barrier method that can reduce the transmission of HIV and other STDs, in addition to preventing pregnancy. In contrast, IUDs, Norplant, and oral contraceptives are effective in preventing pregnancy but do not provide protection against the transmission of HIV and STDs. IUDs prevent pregnancy by affecting sperm movement and survival, Norplant releases hormones to prevent ovulation, and oral contraceptives work by inhibiting ovulation. However, these methods do not create a physical barrier against HIV and STD transmission. It is important to counsel clients using methods like IUDs, Norplant, and oral contraceptives to also use chemical or barrier contraceptives to lower the risk of HIV or STD transmission.

Correct Answer: D

Rationale: An internal gynecological examination is performed with the client in the lithotomy position. In this position, the client is supine, with the feet in stirrups, the knees apart, and the buttocks at the end of the examining table. The client is draped so that only the vulva is exposed. The lithotomy position provides optimal access for the healthcare provider to perform the examination effectively. The prone position refers to lying on the stomach, which is not suitable for a gynecological exam. The Sims position is a left side-lying position primarily used for administering enemas, not for gynecological examinations.

Correct Answer: A

Rationale: The correct answer is 'every 24 hours.' Changing the intravenous tubing on total parenteral nutrition solutions every 24 hours is crucial due to the high risk of bacterial growth. Bacterial contamination can lead to serious infections in patients receiving total parenteral nutrition. Choices B, C, and D are incorrect because waiting longer intervals between tubing changes increases the risk of bacterial contamination and infection, compromising patient safety. It is essential to maintain a strict 24-hour schedule to minimize the risk of complications associated with bacterial contamination.