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: Surgery
Caution is taken while doing IMF for which of these types of patients? 
Select and explain. 
A. Substance abusers, B. Epileptics, C. Psychiatric disorders, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: These conditions are contraindications for post-operative IMF, and such patients should be treated with internal fixation only.