Non-narcotic agents cause:

Correct Answer: B

Rationale: The correct answer is B: Antipyretic effect. Non-narcotic agents, such as NSAIDs, have antipyretic properties, helping to reduce fever by acting on the hypothalamus. This is achieved without causing respiratory depression (A), euphoria (C), or physical dependence (D). NSAIDs work by inhibiting prostaglandin synthesis, which helps in reducing inflammation, pain, and fever without affecting the respiratory center or causing addictive tendencies. Thus, option B is the correct choice based on the pharmacological actions of non-narcotic agents.

Correct Answer: C

Rationale: The correct answer is C: General tonics. General tonics are CNS stimulants that help mitigate conditions of weakness or lack of tone in the entire organism or specific organs by providing a non-specific boost in energy and vitality. Psychostimulants (A) primarily target mental alertness and focus, not overall weakness. Analeptics (B) are CNS stimulants that specifically stimulate the respiratory centers and are not general tonics. Antidepressants (D) are used to treat mood disorders and do not directly address physical weakness or lack of tone.

Correct Answer: B

Rationale: The correct answer is B: Triazolam. Triazolam has a short half-life and rapid onset of action, making it more likely to cause "hangover" effects the next day due to its fast clearance from the body. This can lead to residual sedation, drowsiness, dysphoria, and mental or motor depression. In contrast, choices A, C, and D have longer half-lives and slower onset of action, reducing the likelihood of significant hangover effects. Oxazepam (A) is known for its long half-life and minimal hangover effects. Clorazepate (C) and Lorazepam (D) also have longer durations of action compared to Triazolam, making them less likely to cause next-day hangover effects.

Correct Answer: A

Rationale: The correct answer is A: Sevoflurane. Sevoflurane is the inhaled anesthetic that increases cerebral blood flow the least due to its minimal effect on cerebral vasodilation. Sevoflurane has a lower blood-gas partition coefficient compared to the other choices, resulting in faster onset and offset of action. This rapid clearance from the blood reduces its impact on cerebral blood flow. In contrast, Nitrous oxide (Choice B) is a potent cerebral vasodilator, Isoflurane (Choice C) and Desflurane (Choice D) also have higher blood-gas partition coefficients leading to more significant effects on cerebral blood flow compared to Sevoflurane.

Correct Answer: A

Rationale: The correct answer is A: TRUE. Antacids, such as calcium carbonate or magnesium hydroxide, are weak bases that neutralize stomach acid (hydrochloric acid) by forming salt and water. This reaction helps to relieve symptoms of heartburn and indigestion. Option B is incorrect as antacids indeed react with gastric acid. Option C is incorrect as not all choices are correct, and Option D is incorrect as at least one of the choices is correct.