This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lithium, Subject name: Pharmacology
[{'content': 'Lithium causes decrease of which ion - \nSelect and explain. \nA. K+, B. Ca2+, C. Cl-, D. Mg2+', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., K+ o Lithium can cause hypokalemia.Side effects of lithium1) Neurological: - Tremor is the commonest side effect of lithium. Other CNS side effects are giddiness, ataxia, motor incordination, hyperreflexia, mental confusion, nystagmus.2) Renal: - Nephrogenic diabetes insipidus with polyuria & polydipsia. Amiloride is the DOC for Lithium induced nephrogenic DI.3) Cardiovascular: - Effects are similar to hypokalemia which causes arrhythmia. Most common ECG change is T wave depression.4) Endocrine: - Goitre, hypothyroidism.5) GIT: - Nausea, vomiting, diarrhoea, metallic test, abdominal pain.6) Dermatological: - Acneiform eruptions, papular eruption, exacerbation of psoriasis.7) Teratogenicity: - Ebstein's anomaly in fetus.", 'role': 'assistant'}]