Which of the following statements is true?

Correct Answer: D

Rationale: Rationale: - A: D1 receptors are indeed found in the striatum - B: D2 receptors are present in the striatum and limbic areas - C: D4 receptors are located in the frontal cortex and mesolimbic system Therefore, the correct answer is D as all statements are true, covering the distribution of D1, D2, and D4 receptors in the specified brain regions. Other choices are incorrect as they do not include all the correct statements.

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: D

Rationale: Cocaine may cause powerful vasoconstrictive reactions, leading to myocardial infarctions due to increased blood pressure and heart strain. It can also result in multiple brain perfusion defects due to restricted blood flow. Additionally, cocaine use during pregnancy can lead to spontaneous abortion due to its harmful effects on fetal development. Therefore, the correct answer is D, as all of these adverse effects are associated with cocaine use. Choices A, B, and C are incorrect as they do not cover the full spectrum of potential harm caused by cocaine.

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.