This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anaesthesia, Subject name: Pharmacology
Mechanism of action of dantroline is? 
Select and explain. 
A. Inhibits Ca++ secretion from sarcoplasm, B. Binds to ryanodine receptors to block release of Ca++, C. Inhibits GABA, D. Inhibits Gamma motor neuron
B: Binds to ryanodine receptors to block release of Ca++
Answer: B: Binds to ryanodine receptors to block release of Ca++ 
Explanation: Ans. (b) Binds to ryanodine receptors to block release of Ca++Ref: Lippincott 5thed 344