Which of the following statements regarding weight control is correct?

Correct Answer: A

Rationale: Exercise is more important for weight loss in overweight individuals . Exercise burns caloriand boosts metabolism, critical for overweight people, per obesity guidelines. Choice B is false; behavior therapy (e.g., CBT) aids weight control. Choice C is incorrect; metabolic rate decreasin deprivation to conserve energy. Choice D is wrong; basal metabolism is ~60-70% of expenditure, not one-third. is false; psychology (e.g., motivation) is key. As truth exercisoutsized role in calorie deficit contrasts with the errors of B-E, making it the correct answer.

Correct Answer: C

Rationale: Dopamine deficiency is thought to cause psychosis , which is false. Excess dopamine causpsychosis (e.g., schizophrenia), per the dopamine hypothesis; deficiency causParkinsons. Choice A is true; tyrosine forms catecholamin(dopamine, norepinephrine). Choice B is incorrect but not the answer indolaminare serotonin only, not acetylcholine (a typo?). Choice D is true; MAO breaks down norepinephrine. Reversal deficiency vs. excess makes itthe exception, per psychopharmacology, making it the correct answer.

Correct Answer: D

Rationale: A lumbar puncture (LP) is contraindicated when there is a risk of causing harm, such as brain herniation or introducing infection. Suspected mass lesions of the brain or spinal cord increase intracranial or intraspinal pressure, risking herniation if CSF is removed. Symptoms of impending cerebral herniation also contraindicate LP due to the danger of worsening pressure dynamics. Skin infection at the puncture site , however, is not an absolute contraindication; while it increasinfection risk, it can often be managed with alternative sitor sterilization, unlike the other conditions which pose immediate, severe risks. Thus, D is the exception and the correct answer, as it donot universally prohibit LP in the same critical way as A, B, or C.

Correct Answer: D

Rationale: Mobius syndrome is a congenital condition involving cranial nerve deficits, typically VI (abducens) and VII (facial), leading to bilateral facial weakness and abducens paralysis , impairing eye abduction. Hypoplasia or agenesis of brainstem nuclei underlithese deficits. Feeding difficultiare common due to facial weakness affecting sucking/swallowing. However, mental retardation is not a consistent feature; most individuals have normal intelligence unless complicated by other factors. Thus, D is the exception and correct answer, as Mobius syndrome primarily affects motor cranial nervrather than cognitive function, distinguishing it from conditions with broader neurologic impact.

Correct Answer: C

Rationale: CSF is primarily produced by the choroid plexus, with about 25% from extrachoroidal sourc, true. A child produc~20 mL/hr , and CSF flows from lateral ventriclvia the foramina of Monro to the third ventricle , both true. CSF is absorbed by arachnoid villi , also true. However, the total CSF volume in an infant is ~50-100 mL, not 150 mL , which is closer to adult levels. Thus, C is false and the correct answer, as it overestimatinfant CSF volume, misaligning with developmental physiology.