Correct option is B
Greengram (Moong Dal) is termed as "Golden Gram" due to its nutritional value and economic importance. It is a rich source of protein and is highly preferred in Indian diets.
Explanation of other options:
(a) Cowpea: Known as "Lobia" or "Black-eyed Peas."
(c) Blackgram: Referred to as "Urad Dal."
(d) Bengalgram: Commonly known as "Chickpea" or "Chana Dal."