A 25 year old infertile male underwent semen analysis. Results show: sperm count – 15 million/ ml; pH – 7.5; volume – 2 ml; no agglutination is seen. Morphology shows 60% normal and 60% motile sperms. Most likely diagnosis is:a) Normospermiab) Oligospermiac) Azoospermiad) Aspermia