Which sentences are correct?

Correct Answer: B

Rationale: The correct answer is B: 1 and 2 only. Sentence 1 and 2 are correct because they are grammatically accurate and logically coherent. Sentence 3 is incorrect as it contains a grammatical error. The key is to analyze each sentence independently to determine its correctness based on grammar, clarity, and logical consistency. In this case, only sentences 1 and 2 meet the criteria, making B the correct choice.

Correct Answer: B

Rationale: The correct answer is B (green, violet) because green has a lower frequency than violet in the visible light spectrum. Green light has a wavelength longer than violet light, meaning it has lower frequency. This is based on the electromagnetic spectrum where colors are arranged in order of increasing frequency from red (lowest) to violet (highest). Other choices are incorrect because they do not follow the order of increasing frequency as per the visible light spectrum.

Correct Answer: B

Rationale: The correct answer is B: iodine. Iodine is an essential element required for the synthesis of thyroid hormone. Thyroid hormones such as thyroxine (T4) and triiodothyronine (T3) contain iodine atoms. Without sufficient iodine, the thyroid gland cannot produce these hormones, leading to thyroid disorders like hypothyroidism or goiter. Copper (A), sulfur (C), and zinc (D) are not directly involved in the synthesis of thyroid hormone. Copper is important for enzyme function, sulfur is present in amino acids, and zinc is involved in various cellular processes but not specifically in thyroid hormone synthesis.

Correct Answer: A

Rationale: The correct answer is A: damage to the pineal gland. The pineal gland does not regulate ADH secretion; it primarily produces melatonin. Neurosurgery and general anesthesia may disrupt the feedback mechanisms controlling ADH release. Ectopic ADH secretion by pulmonary cancer can lead to excessive ADH production. The key is to identify a situation where ADH hypersecretion is less likely to occur due to the gland's function.

Correct Answer: C

Rationale: The middle thyroid vein drains into the internal jugular vein due to its anatomical location in the neck. The internal jugular vein receives blood from the brain, face, and neck, making it a suitable drainage site for the thyroid gland. The other options (A, B, D) are incorrect because the brachiocephalic vein drains the upper body, the external jugular vein drains the scalp and face, and the subclavian vein drains the upper extremities, none of which are anatomically linked to the thyroid gland.