Information: - Platonic love (often lower-cased as platonic) is a type of love that is non-sexual. The term is named after Plato, who described a kind of love centered on same-gender relations and included sex which underwent a transformation during Renaissance (15th16th centuries) to get its contemporary sense of asexual heterosexual love. - A long - distance relationship ( LDR ) ( or long - distance romantic relationship ( LDRR ) ) is an intimate relationship between partners who are geographically isolated from one another . Partners in LDRs face geographic separation and lack of face - to - face contact . LDRs are particularly prevalent among college students - constituting 25 % to 50 % of all LDRs . Even though scholars have reported a signicant number of LDRRs in undergraduate populations , long - distance relationships continue to be an '' understudied '' phenomenon . - An intimate relationship is an interpersonal relationship that involves physical and/or emotional intimacy. Physical intimacy is characterized by friendship, platonic love, romantic love or sexual activity. While the term "intimate relationship" commonly implies the inclusion of a sexual relationship, the term is also used as a euphemism for a relationship that is strictly sexual. - Friendship is a relationship of mutual affection between people. Friendship is a stronger form of interpersonal bond than an association. Friendship has been studied in academic fields such as sociology, social psychology, anthropology, and philosophy. Various academic theories of friendship have been proposed, including social exchange theory, equity theory, relational dialectics, and attachment styles. A World Happiness Database study found that people with close friendships are happier. - An interpersonal relationship is a strong, deep, or close association or acquaintance between two or more people that may range in duration from brief to enduring. This association may be based on inference, love, solidarity, regular business interactions, or some other type of social commitment. Interpersonal relationships are formed in the context of social, cultural and other influences. The context can and may and perhaps will vary from family or kinship relations, friendship, marriage, relations with associates, work, clubs, neighborhoods, and places of worship. They may be regulated by law, custom, or mutual agreement, and are the basis of social groups and society as a whole. After reading the paragraphs above, we are interested in knowing the entity with which 'long-distance relationship' exhibits the relationship of 'subclass of'. Find the answer from the choices below. Choices: - attachment - database - duration - euphemism - friendship - gender - inference - interpersonal relationship - law - love - marriage - people - philosophy - physical intimacy - relationship - renaissance - sense - term - type - work - world
A:
interpersonal relationship