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
Triple surgery in glaucoma includes all of the following except: 
Select and explain. 
A. Trabeculectomy, B. PCIOL implantation, C. Insertion of drainage device, D. Extra capsular cataract extraction
C: Insertion of drainage device
Answer: C: Insertion of drainage device 
Explanation: (Refer: AK Khurana Comprehensive Ophthalmology, 6th edition, pg no. 253)
Triple Procedure for Glaucoma:

TRABECULECTOMY
ECCE
PCIOL INSERTION