The posterior pituitary does NOT secret:

Correct Answer: C

Rationale: The correct answer is C: Growth hormone. The posterior pituitary gland only secretes Vasopressin (A) and Oxytocin (B). Growth hormone (C) is actually secreted by the anterior pituitary gland. Therefore, option C is incorrect. Option D is also incorrect as the posterior pituitary does secrete Vasopressin and Oxytocin.

Correct Answer: C

Rationale: The correct answer is C: Metamizole (Analgin). Metamizole is a pyrazolone derivative due to its chemical structure containing a pyrazolone ring. Ibuprofen (A) is a propionic acid derivative, Indomethacin (B) is an indole derivative, and Diclofenac (D) is a phenylacetic acid derivative. Pyrazolone derivatives like Metamizole are known for their analgesic, antipyretic, and anti-inflammatory properties.

Correct Answer: D

Rationale: The correct answer is D because I.V. IgG preparations compete for Fc receptors with autoantibodies. This blocks the binding of autoantibodies to their target antigens, thereby preventing autoimmune reactions. Choice A is incorrect as I.V. IgG does not inhibit CD3 receptors. Choice B is incorrect as it does not inhibit calcineurin. Choice C is incorrect as I.V. IgG does not induce complement-mediated cytolysis of T lymphocytes.

Correct Answer: A

Rationale: The correct answer is A: Scurvy is a disease caused by a deficiency of vitamin C. This deficiency leads to symptoms such as spongy bleeding gums, bleeding under the skin, and weakness. - Choice B is incorrect because extreme dryness of the conjunctiva is not a symptom of scurvy, and it is more related to a deficiency of vitamin A. - Choice C is incorrect because it describes symptoms of pellagra, a disease caused by a deficiency of niacin, not scurvy. - Choice D is incorrect because it includes all the incorrect options, making it incorrect as well. In summary, the correct choice (A) accurately describes the cause and symptoms of scurvy, while the other choices describe different diseases with unrelated symptoms.

Correct Answer: A

Rationale: The correct answer is A: TRUE. Cholesterol synthesis inhibitors, like statins, reduce cholesterol production in the liver, leading to an upregulation of LDL receptors on hepatocytes. This increases the clearance of LDL cholesterol from the plasma, ultimately lowering LDL levels. Therefore, the statement that cholesterol synthesis inhibitors increase the rate of clearance of LDL cholesterol from the plasma is true. Choices B, C, and D are incorrect because they do not accurately reflect the relationship between cholesterol synthesis inhibitors and LDL cholesterol clearance.