What was segment C when segment D was fluorescent tubes? 
CREATE TABLE table_15187735_1 (segment_c VARCHAR, segment_d VARCHAR)
SELECT segment_c FROM table_15187735_1 WHERE segment_d = "Fluorescent Tubes"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_15187735_1 (segment_c VARCHAR, segment_d VARCHAR) Question: What was segment C when segment D was fluorescent tubes?  [/INST] SELECT segment_c FROM table_15187735_1 WHERE segment_d = "Fluorescent Tubes" </s>