Correct Answer: A

Rationale: The correct answer is A: Liver. Cancer cells commonly metastasize to the liver due to its rich blood supply, making it an ideal environment for tumor growth. Liver metastasis can occur from various primary cancer sites. The liver filters blood and is susceptible to receiving cancer cells circulating in the bloodstream. Metastasis to the colon (B) is less common as it is typically the primary site for colon cancer. Metastasis to the reproductive tract (C) can occur but is not as common as liver metastasis. White blood cells (D) are a part of the immune system and do not serve as a common site for cancer metastasis.

Correct Answer: D

Rationale: The correct answer is D: Polyps. Polyps in the colon are precancerous growths that can develop into colorectal cancer over time. Identifying polyps during a medical history interview can raise suspicion for colorectal cancer due to their potential to progress into malignancy. Duodenal ulcer (A) is not directly related to colorectal cancer. Weight gain (B) is a non-specific symptom and does not specifically indicate colorectal cancer. Hemorrhoids (C) are common and usually benign, not directly linked to colorectal cancer.

Correct Answer: B

Rationale: The correct answer is B: The client wears a watch and wedding band. This is because metal objects such as watches and jewelry can be hazardous during an MRI scan due to the strong magnetic field, leading to potential movement or heating of the metal objects, causing harm to the client. A: The client lies still - This is important for obtaining clear images during an MRI scan and does not pose a threat to the client. C: The client asks questions - Asking questions during an MRI scan does not pose a direct threat to the client's safety. D: The client hears thumping sounds - Thumping sounds are a normal part of the MRI scan and do not pose a threat to the client's safety.

Correct Answer: A

Rationale: The correct answer is A: Liver. Cancer cells commonly metastasize to the liver due to its rich blood supply, making it an ideal environment for tumor growth. Liver metastasis can occur from various primary cancer sites. The liver filters blood and is susceptible to receiving cancer cells circulating in the bloodstream. Metastasis to the colon (B) is less common as it is typically the primary site for colon cancer. Metastasis to the reproductive tract (C) can occur but is not as common as liver metastasis. White blood cells (D) are a part of the immune system and do not serve as a common site for cancer metastasis.

Correct Answer: A

Rationale: The correct answer is A because educating young adults about the rise in heterosexual transmission of HIV is crucial to prevent the spread of AIDS. This information helps them understand the importance of safe sex practices and awareness of risks. Choice B is incorrect as HIV transmission in children is not primarily due to sexual abuse. Choice C is also incorrect as herpes zoster is not a form of the HIV virus. Choice D is incorrect as transmission by IV drug users is not prominent with sterile equipment use. Focusing on the rise in heterosexual transmission is key in teaching young adults about AIDS prevention.