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: Physiology
All are effect of parasympathetic system on hea except - 
Select and explain. 
A. Negative chronotropic, B. Negative ionotrophic, C. Negative dromotropic, D. All are seen
B: Negative ionotrophic
Answer: B: Negative ionotrophic 
Explanation: Ans. is 'b' i.e., Negative inotropic