Correct option (b) Diplotene of meiosis
Explanation :
Lampbrush chromosomes were reported by W Flemming (1882) and described by Ruckert (1892) from nuclei of yolk rich primary oocytes of newts and frog (amphibians). These are also found in spermatocytes of many animals. These are found in permanent diplotene stage of meiosis and do not undergo cell cycle.
Each such chromosome has a double main axis made up of DNA and histones. The chromosomes are coiled and held at many places forming cross like structure called chiasmata. Loops arising laterally has uncoried DNA which helps in rapid transcription and yolk synthesis.
