This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Trauma, Subject name: Surgery
[{'content': 'Most common organ injured in submerged head underwater explosion: \nSelect and explain. \nA. Tympanic membrane, B. GIT, C. Lungs, D. Hea', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Air blast Most commonly injured organ - tympanic membrane Most severely injured organ - lungs Under water blast Most commonly injured organ If head is out of water - small intestine If head is submerged - tympanic membrane Most severely injured organ - small intestine', 'role': 'assistant'}]