Captain (Retd.) Abdus Sabur Khan, Chairman of Opsonin Pharma limited, presiding over its “Annual Sales Conference 2019” at International Conference City Bashundhara (ICCB) in the city on Monday. Abdur Rouf Khan, Managing Director, Abdur Rakib Khan, DMD, Abdul Momen Talukder, General Manager (Sales & Marketing), Md. Mahmudul Haq and other senior officials of the company were also present.