Which gland is responsible for producing oil for the skin?

Correct Answer: B

Rationale: Sebaceous glands produce sebum, an oil lubricating skin and hair, secreted via hair follicles in the dermis. Sweat glands produce sweat for cooling. Ceruminous glands make earwax, not skin oil. Mammary glands secrete milk. Sebaceous glands' oily output, preventing dryness, per integumentary function, makes 'b' correct.

Correct Answer: B

Rationale: Twelve thoracic vertebrae (T1-T12) articulate with ribs, forming the mid-spine's curvature. Seven is cervical, five is lumbar, three is miscount. Thoracic's rib connection, per vertebral count, makes 'b' correct.

Correct Answer: C

Rationale: The vertebral foramen, a central hole in each vertebra, contains the spinal cord, forming the spinal canal when stacked. Vertebral arch encloses it, spinous and transverse processes are projections, not containers. Foramen's role, per vertebra structure, makes 'c' correct.

Correct Answer: A

Rationale: Intervertebral discs, fibrocartilage pads between vertebrae, absorb shock, cushioning spinal movement. Foramen houses the cord, spinous and transverse processes anchor muscles not shock absorbers. Discs' role, per spine function, makes 'a' correct.

Correct Answer: A

Rationale: All nutrient classes carbohydrates, lipids, proteins (macronutrients), vitamins, minerals (micronutrients) are essential for survival, supporting energy, structure, and regulation. Micronutrients like vitamin D can be stored, not daily required. Carbohydrates, lipids, proteins are macronutrients, not micro. Macronutrients aren't vitamins/minerals, those are micro. Essentiality of all, per nutrition, makes 'a' true.