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: Ophthalmology
In caloric test left jerk nystagmus occurs when: 
Select and explain. 
A. Cold water is poured in right ear, B. Hot water is poured in right ear, C. Cold water is poured in left ear, D. All of the above
A: Cold water is poured in right ear
Answer: A: Cold water is poured in right ear 
Explanation: Ans. Cold water is poured in right ear