. Respiratory centre depression is caused by all except-: (A) Opium, (B) Strychnine, (C) Barbiturates, (D) Gelsemium
Answer is B. Strychnine is a toxic alkaloid that acts as an antagonist of the inhibitory glycine receptor of CNS,thereby producing overstimulation of nervous system. Barbiturates,opioids and gelsemium(yellow jasmine) are potential respiratory centre depressants.