This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: A.N.S., Subject name: Pharmacology
Cholinomimetic is contraindicated in: 
Select and explain. 
A. Glaucoma, B. Myasthenia gravis, C. Postoperative ileus, D. Partial heart block
D: Partial heart block
Answer: D: Partial heart block 
Explanation: Ans. D. Partial heart blocka. Cholinergic system has Inhibitory effect on heart mediated by M2 receptors.b. Cholinomimetics can convert a partial heart block into a complete heart block due to negative chronotropic,c. Dromotropic properties.