This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Testis & Scrotum, Subject name: Surgery
[{'content': 'What is oligospermia? \nSelect and explain. \nA. Sperm count < 20 million/ c.mm, B. Absence of sperms, C. Absence of semen, D. Decreased spermatogenesis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans: a (Sperm count <20 million/c.mm) Ref: Bailey, 24th ed,p. 1416; Shaw, 13th ed,p. 202Oligospermia (Oligozoospermia)- Mild - 10 - 20 million/ c.mm- Moderate -5-10 million/ c.mm- Severe - <5 million/ c.mmAspermia -no semen.(anejaculation)Azoospermia -no sperm in semenAsthenospermia -no motile sperm or diminished motilityNecrospermia -dead sperms (all sperms are nonmotile or nonviable)Teratospermia -abnormal morphology of spermsLeucocytospermia -increased white cells in semenOligoasthenoteratozoospermia -sperm variables all subnormalPolyzoospermia -count is more than 350 million/c.mmNormozoospermia -all semen parameters normal', 'role': 'assistant'}]