This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Unknown
Hyperkalemia is caused by: 
Select and explain. 
A. N2O, B. Atracurium, C. Succinyl choline, D. Pancuronium
C: Succinyl choline
Answer: C: Succinyl choline 
Explanation: (Refer: Miller’s, Clinical Anaesthesia, 7th edition, pg no: 2373-2383)
Systemic effects of Succinyl choline

Cardiovascular system - Profound bradycardia
Hyperkalemia - Due to excessive muscle fasciculations.
CNS - Increases intracranial tension.
Eye - Increases intraocular tension.
GIT - Increases intragastric pressure, increases salivation,gastric secretions and peristalsis.
Muscle pains - Due to excessive muscle contractions.
Malignant hyperthermia-SCh is the most common drugcausing this.
Anaphylaxis.
Masseter spasm.