The majority of lumbar disc herniations occur at the level of:

Correct Answer: B

Rationale: The majority of lumbar disc herniations occur at the level of L4-L5. This is because the L4-L5 disc segment bears the highest amount of stress and load in the lumbar spine due to its location and mechanics. The intervertebral disc between the fourth (L4) and fifth (L5) lumbar vertebrae is subject to repetitive movements and mechanical stress, making it more susceptible to herniation compared to other levels in the lumbar spine. Additionally, the anatomy of the L4-L5 disc makes it more prone to degeneration and herniation, leading to a higher prevalence of herniated discs at this level.

Correct Answer: D

Rationale: Autonomic dysfunction in TBI typically involves elevated temperature, heart rate, and respiratory rate due to dysregulation of the autonomic nervous system. Lowered blood pressure is less common and may indicate hypovolemia or other conditions rather than autonomic dysfunction.

Correct Answer: D

Rationale: Hypothyroidism is not a typical risk factor for obstructive sleep apnea.

Correct Answer: D

Rationale: Playing with toys designed for the opposite sex does not necessarily indicate GID, as it is a common exploratory behavior in childhood.

Correct Answer: A

Rationale: HPV type 6 is typically associated with low-grade lesions and genital warts, not cervical carcinoma.