Question:
Who was the head of Germany in Apr, 2004?

Context:
 Walter Scheel is the head of the government of Germany from May, 1974 to May, 1974. 
 Helmut Kohl is the head of the government of Germany from Oct, 1982 to Oct, 1998. 
 Kurt Georg Kiesinger is the head of the government of Germany from Dec, 1966 to Oct, 1969. 
 Konrad Adenauer is the head of the government of Germany from Sep, 1949 to Oct, 1963. 
 Willy Brandt is the head of the government of Germany from Oct, 1969 to May, 1974. 
 Olaf Scholz is the head of the government of Germany from Dec, 2021 to Dec, 2022. 
 Angela Merkel is the head of the government of Germany from Nov, 2005 to Dec, 2021. 
 Gerhard Schröder is the head of the government of Germany from Oct, 1998 to Oct, 2005. 
 Helmut Schmidt is the head of the government of Germany from May, 1974 to Oct, 1982. 
 Ludwig Erhard is the head of the government of Germany from Oct, 1963 to Nov, 1966.

Answer:
Gerhard Schröder