This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hypeension, Arrhythmias, Dyslipidemia, Subject name: Pharmacology
Which of the following statements is WRONG about amiodarone? 
Select and explain. 
A. It is longest acting anti-arrhythmic drug., B. It has positive ionotropic action, C. It contains iodine, D. It causes pulmonary fibrosis.
B: It has positive ionotropic action
Answer: B: It has positive ionotropic action 
Explanation: Amiodarone is an iodine containing highly lipophilic longest-acting(T1/2 = >3 wks) antiarrhythmic drug exes multiple actions: Prolongs APD and Q-T interval attributable to block of myocardial delayed rectifier K+ channels. This also appears to reduce nonuniformity of refractoriness among different fibres. Na+ channel blocker b- Blocker action Ca2+ channel blocker Adverse effects: - Hypo/hyper thyroid Peripheral neuropathy Myocardial depression Pulmonary fibrosis Liver toxicity Corneal deposits Photosensitivity