What is the primary goal of palliative care in cancer treatment?

Correct Answer: C

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.

Correct Answer: C

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.

Correct Answer: C

Rationale: The correct answer is C. IgE molecules do not cross the placenta and fix complement, unlike IgG. IgE is the principal immunoglobulin in allergic reactions (A), mediates anti-parasitic immune responses (B), and triggers the release of histamine and other mediators (D). IgE plays a specific role in allergic responses and defense against parasites. IgG is the main immunoglobulin that crosses the placenta and fixes complement. Therefore, IgE does not share this function.

Correct Answer: A

Rationale: The correct answer is A because class switching of immunoglobulins typically occurs during an immune response, leading to the production of antibodies of different classes like IgM to IgG. This process helps enhance the immune response and memory. Choice B, binding complement, refers to the function of antibodies in the classical pathway of the complement system, not class switching. Choice C, causing histamine release, is typically associated with IgE antibodies in allergic reactions, not class switching. Choice D, mediating immunoglobulin class switching, is too vague and does not provide a clear explanation compared to choice A.

Correct Answer: B

Rationale: The correct answer is B: Vitamin D. Vitamin D is essential in treating osteoporosis because it helps the body absorb calcium, a crucial mineral for bone health. Without sufficient Vitamin D, the body cannot effectively utilize calcium, leading to weakened bones. Vitamin A (Choice A) is not directly linked to osteoporosis treatment. Vitamin B12 (Choice C) is important for red blood cell production but not specifically for osteoporosis. Vitamin C (Choice D) aids in collagen formation but does not play a primary role in treating osteoporosis.