Multiple choice general knowledge Rhone - Poulenc and Hoechst merged to form which company? Toyota Aventis Porche Helias Reveal answer Fill a bubble to check yourself B Correct answer Explanation Rhone-Poulenc (French) and Hoechst (German) were pharmaceutical companies that merged in 1999 to form Aventis, which later became part of Sanofi. Toyota, Porsche, and Helias are automotive companies or unrelated to this pharmaceutical merger.