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: Dental
Crosslinking in denture base resin is contributed by: 
Select and explain. 
A. Glycol dimethacrylate, B. Benzoyl peroxide, C. N-Para toluidine, D. Methyl methacrylate
A: Glycol dimethacrylate
Answer: A: Glycol dimethacrylate 
Explanation: Composition of Heat activated denture base resin
Liquid:

Monomer – MMA
Plasticizer – Dibutyl phthalate
Cross-linking agent – Ethylene glycol dimethacrylate
Inhibitor – Hydroquinone (0.006%).