Gram belongs to the family-
A) Gramineae
B) Papilionaceae
C) Compositae
D) Solanaceae

Hint: Gram is a leguminous plant. It belongs to a family also known as Leguminaceae, commonly known as the pea or bean family.

Complete answer:
The Fabaceae or Papilionaceae or Leguminosae, is a large family and is also economically important as it also incorporates some of the flowering plants of ornamental value. Various trees, shrubs, and perennial or annual herbaceous plants are involved in this family. Such plants can be easily recognized by appearance of their fruit and their stipulated, compound leaves. papilionaceae is widely distributed, it is ranked third-largest family of plants living on land after Orchidaceae and Asteraceae. It has around 751 genera having about 19,000 species under them. The Astragalus contains over 3,000 species, Acacia has over 1000 species, Indigofera having around 700 species), Crotalaria having about 700 species, and Mimosa consists of around 400 species, these genera constitute a quarter of all legume species. Leguminosae is the most common family found in tropical rainforests of America and Africa.
On the basis of recent molecular and morphological evidence, Fabaceae is considered as a single monophyletic family. This fact is not only supported by many recent phylogenetic studies based on DNA sequences but also by the degree of interrelations shown by different groups within the family. These studies confirm that Fabaceae is a monophyletic group. Fabaceae belongs to the order Fabales, It is closely related to Polygalaceae, Surianaceae and Quillajaceae. The chickpea or gram has the botanical name- Cicer arietinum. It is a legume of the family Fabaceae or Papilionaceae.

Thus, the correct answer is option - B. Papilionaceae.

Note:Papilionaceae includes a number of agriculturally important plants such as Glycine max (soybean), Pisum sativum (pea), Phaseolus (beans), Ceratonia siliqua (carob), Medicago sativa (alfalfa), Cicer arietinum (chickpeas), Arachis hypogaea (peanut), and Glycyrrhiza glabra (liquorice). Several weed pest species are also found in different parts of the world, including: Robinia pseudoacacia (black locust), Cytisus scoparius (broom), etc.