This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Infeility (Eggs'plantation!), Subject name: Gynaecology & Obstetrics
[{'content': 'WHO criteria for semen analysis, which of the following is the only TRUE statement \nSelect and explain. \nA. Progressive motility >15%, B. Normal morphology >25%, C. Volume of 2-5ml, D. Sperm count >39million', 'role': 'user'}, {'content': 'Answer: D \nExplanation: World Health Organization reference values: Semen volume: 1.5 ml or more pH: 7.2-7.8 Sperm concentration: 15 million spermatozoa per ml or more Total sperm number: 39 million spermatozoa per ejaculate or more ( Range 36-42 million /ml) Total motility : 40% or more motile or 32% or more with progressive motility Round cells: <5 million /mL Vitality: 58% or more live spermatozoa Sperm morphology (Strict criteria ): 4% or more of normal forms Sperm Agglutination:<2', 'role': 'assistant'}]