This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Renal physiology, Subject name: Physiology
[{'content': 'Residual urine is? \nSelect and explain. \nA. Urine left in the urinary bladder after micturation, B. Normal phenomenon, C. Never seen with urinary bladder dysfunction, D. Common finding of examination anxiety', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Initially urinary bladder respond at irregular intervals to adequate internal distance and by contraction of detrusor muscle. these contractions are not powerful enough or well coordinator result in incomplete maturation. Thus a large volume of urine may be left in the bladder called as residual urine. Ref: page no 584 Textbook of physiology Volume 1 AK Jain 7th edition', 'role': 'assistant'}]