Which among the following has 23 chromosomes ?

Oogonia Zygote Spermatogonia Secondary spermatocytes

Secondary spermatocytes

Primary spermatocytes, like spermatogonia, are diploid and have 46 chromosomes. Each primary spermatocytes goes through the first meiotic division, meiosis I, to produce two secondary spermatocytes, each with 23 chromosomes (haploid).