Institution: জাতীয় কবি কাজী নজরুল ইসলাম বিশ্ববিদ্যালয় (JKKNIU) Exam: গ ইউনিট || জাতীয় কবি কাজী নজরুল ইসলাম বিশ্ববিদ্যালয় || 2012
Topic: বর্ণমালা, Subject: Bangla (বাংলা)

Best Answer Explained in Below-:

The quote 'পাথুরে কয়লা হীরার সবর্ণ না হলেও সগোত্র' (translated: 'Coal is related to diamond, even if it is not of the same shining quality') is attributed to Promoth Chowdhury, a prominent figure in Bengali literature. Chowdhury was known for his philosophical reflections and deep insights into the human experience, often using metaphor and allegory to convey complex ideas.

The essence of this quote lies in the relationship between different forms of matter and their inherent value. It draws a parallel between coal and diamonds, suggesting that while they differ in appearance and worth, they share a fundamental kinship as carbon-based substances. This idea reflects Promoth Chowdhury's perspective on social and human relationships—emphasizing that people, like different materials, may have varying levels of societal recognition or brightness but hold intrinsic value at their core.

The other options, while notable figures—Rabindranath Tagore, Kazi Nazrul Islam, and Shamsur Rahman—did not employ this specific metaphor or theme as prominently in their works. Thus, 'd: প্রমথ চৌধুরী' is the correct answer, rooted in both context and style of expression.