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: Gynaecology & Obstetrics
A patients semen sample reveals : 15 million sperms, 60 % normal morphology, 60% motile; sperm volume is 2 ml; no agglutination is seen; diagnosis is: 
Select and explain. 
A. Azoospermia, B. Aspermia, C. Oligospermia, D. Normospermia
C: Oligospermia
Answer: C: Oligospermia 
Explanation: Oligospermia is defined as a sperm count below 20 million/mL. Ref: Shaw's Textbook of Gynaecology, 11th Edition, Page 210 ; Textbook of Obstetrics and Gynaecology By D.C.Dutta, 4th Edition, Pages 217-18, 225