import csv


def read_text_data(filename):
    """
    Reads a csv file to extract text.
    
    Args:
        filename: a string specifying the filename / path
        
    Returns:
        A list of text sentences
    """
    data = []
    with open(filename) as csvfile:
        reader = csv.DictReader(csvfile)
        count = 0
        for row in reader:
            data.append(row['text'])
    csvfile.close()
    return data