Piracetam is widely used for the treatment of:

Correct Answer: D

Rationale: The correct answer is D (All of the above). Piracetam is used for senile dementia due to its cognitive-enhancing effects. It is also used for asthenia (weakness/fatigue) as it helps improve energy levels. Additionally, piracetam is used in chronic alcoholism to aid in cognitive function and reduce neurotoxic effects. Therefore, all three options are correct based on the different therapeutic benefits of piracetam. The other choices are incorrect because each condition mentioned can be treated with piracetam, making option D the most comprehensive and accurate answer.

Correct Answer: B

Rationale: The correct answer is B: Isoprenaline. Isoprenaline is a non-selective beta2-adrenomimic because it stimulates both beta1 and beta2 adrenergic receptors. This leads to effects on both the heart and lungs. Salbutamol, Salmeterol, and Terbutaline are selective beta2-adrenomimics, meaning they primarily target beta2 receptors in the lungs, resulting in bronchodilation without significant effects on the heart. Therefore, they do not belong to the category of non-selective beta2-adrenomimics like Isoprenaline.

Correct Answer: A

Rationale: The correct answer is A: TRUE. Iron deficiency anemia leads to symptoms like pallor, fatigue, dizziness, exertional dyspnea due to decreased oxygen-carrying capacity in the blood. Iron is essential for hemoglobin production, which carries oxygen to tissues. Other choices are incorrect: B is false because iron deficiency anemia does lead to these symptoms. C is incorrect because not all symptoms listed are present in every case of iron deficiency anemia. D is incorrect because the symptoms mentioned are associated with iron deficiency anemia.

Correct Answer: C

Rationale: Rationale: 1. Dobutamine is a beta-1 adrenergic receptor agonist used as an inotropic drug. 2. Continuous use of dobutamine leads to receptor desensitization, causing tolerance. 3. Tolerance develops within a few days due to downregulation of beta-1 receptors. 4. Amrinone and amiodarone are not inotropic drugs and do not cause tolerance. 5. Adenosine is not an inotropic drug and has a rapid onset and short duration of action.

Correct Answer: D

Rationale: The correct answer is D: Propranolol. Propranolol is a non-selective beta-blocker, affecting both beta1 and beta2 receptors. In contrast, choices A, B, and C are cardioselective beta1-adrenoceptor-blocking drugs. Metoprolol, Talinolol, and Atenolol specifically target beta1 receptors in the heart, making them suitable for angina treatment. Propranolol, being non-selective, may lead to unwanted side effects related to beta2 receptor blockade, such as bronchoconstriction and peripheral vasoconstriction. Therefore, for angina patients, cardioselective beta1 blockers are preferred to minimize potential adverse effects.