What is the appropriate initial management for a conscious patient experiencing a syncopal episode (fainting)?

Correct Answer: C

Rationale: The appropriate initial management for a conscious patient experiencing a syncopal episode (fainting) is to provide reassurance and assist the patient to a lying position. This is important to ensure adequate blood flow to the brain and to prevent further injury in case the patient faints again. Elevating the legs above the level of the heart is not recommended as a routine intervention for syncope. Administering intravenous fluids rapidly is not usually needed in the initial management of syncope without signs of dehydration or significant bleeding. Administering oxygen via nasal cannula is not necessary for most cases of syncope unless there are specific indications such as signs of respiratory distress.

Correct Answer: B

Rationale: The recommended screening test for cervical cancer prevention in women aged 21 to 65 years is cytology, also known as a Pap smear. The Pap smear is a test that looks for changes in the cells of the cervix that could indicate the presence of cervical cancer or pre-cancerous conditions. This test is recommended every 3 years for women aged 21-29 years, and every 3-5 years for women aged 30-65 years, depending on the screening method used. HPV testing alone or co-testing with both cytology and HPV testing may be used in certain situations, but for most women in this age group, cytology (Pap smear) alone is the recommended screening test.

Correct Answer: C

Rationale: Among the given options, teratoma (dermoid cyst) is the most common type of ovarian tumor in women of reproductive age. Dermoid cysts are a type of ovarian teratoma that contains tissues derived from the ectoderm (skin), mesoderm (bone, muscle), and endoderm (mucous membranes). They are usually benign and can contain a variety of elements such as hair, teeth, bone, and sebaceous material. Serous cystadenomas and mucinous cystadenomas are more commonly seen in older women, whereas endometriomas are typically associated with endometriosis rather than being the most common ovarian tumor type in women of reproductive age.

Correct Answer: A

Rationale: IgA is the primary immunoglobulin class involved in providing passive immunity to newborn infants through breast milk. IgA antibodies are highly concentrated in colostrum and breast milk, offering important protection to newborns against infections. IgG antibodies can also be passed from the mother to the fetus through the placenta, providing passive immunity during pregnancy, but IgA is the main immunoglobulin class transferred through breast milk for protecting the infant's gastrointestinal and respiratory tracts. IgE is mainly involved in allergies and hypersensitivity reactions, while IgM is an early responder in the immune response to infections.

Correct Answer: B

Rationale: Major histocompatibility complex (MHC) class I molecules are responsible for presenting endogenous antigens, such as viral or intracellular proteins, to CD8+ T cells. These antigens are derived from within the cell, either synthesized within the cell itself or taken up from the cytoplasm. CD8+ T cells, also known as cytotoxic T cells, recognize antigens presented by MHC class I molecules and play a key role in cell-mediated immunity by destroying infected or abnormal cells.