This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Anaesthesia
Absolute contraindication for Thiopentone sodium is\ 
Select and explain. 
A. Respiratory depression, B. Acute intermittent porphyria, C. Liver failure, D. Pregnancy
B: Acute intermittent porphyria
Answer: B: Acute intermittent porphyria 
Explanation: (B) Acute intermittent porphyria # ThiOPENTONE SODIUM - Contraindications: Thiopentone sodium is contraindicated in history of Barbiturate hypersensitivity.> Acute intermittent porphyria (cause LMN paralysis or CVS collapse); Anticipated airway obstruction.> Fixed cardiac output states> Shock, Hepatic/Renal dysfunction> Asthmatic/Myxoedema> Adrenocortical failure> Myotonia dystrophia> Extremes of age