Information:  - Rebetiko, plural rebetika (Greek: , and  respectively), occasionally transliterated as Rembetiko or Rebetico, is a term used today to designate originally disparate kinds of urban Greek music which have come to be grouped together since the so-called rebetika revival, which started in the 1960s and developed further from the early 1970s onwards. Rebetiko briefly can be described as the urban popular song of the Greeks, especially the poorest, from the late 19th century to the 1950s.  - The pater familias, also written as paterfamilias (plural "patres familias"), was the head of a Roman family. The "pater familias" was the oldest living male in a household. He had complete control of all family members. The term is Latin for "father of the family" or the "owner of the family estate". The form is archaic in Latin, preserving the old genitive ending in (see Latin declension), whereas in classical Latin the normal genitive ending was . The "pater familias" was always a Roman citizen.  - Originally, a patriarch was a man who exercised autocratic authority as a pater familias over an extended family. The system of such rule of families by senior males is termed patriarchy.  - Márkos Vamvakáris ( Greek :   ; born 10 May 1905 in Ano Syros , or Án Khra , on Syros Island ; died 8 February 1972 in Athens , Greece ) , was a rebetiko musician . He is universally referred to by rebetiko writers and fans simply by his first name , Márkos . The great significance of Vamvakaris for the rebetiko is also reflected by his nickname : the `` patriarch of the rebetiko '' .    After reading the paragraphs above, we are interested in knowing the entity with which 'markos vamvakaris' exhibits the relationship of 'ethnic group'. Find the answer from the choices below.  Choices: - greek  - greeks  - latin
Answer:
greeks