Question: How many members are in the band that includes Woo Ji-ho under a stage name?
Sentence (from "Zico (rapper)"): Woo Ji-ho (Korean: 우지호; born September 14, 1992), widely known by his stage name, Zico (Korean: ), is a South Korean rapper, producer, singer-songwriter and leader of the boy group Block B, signed under the label Seven Seasons.
Relevant evidence: Yes