<Ul> <Li> Acne fulminans </Li> <Li> Aggravated acne (acne flare) </Li> <Li> Erythema (facial) </Li> <Li> Exanthema </Li> <Li> Hair disorders </Li> <Li> Hirsutism </Li> <Li> Nail dystrophy </Li> <Li> Paronychia </Li> <Li> Photosensitivity reaction </Li> <Li> Pyogenic granuloma </Li> <Li> Skin hyperpigmentation </Li> <Li> Increased sweating </Li> </Ul> <Li> Aggravated acne (acne flare) </Li> <Li> Erythema (facial) </Li> <Tr> <Td> Musculo - skeletal and <P> connective tissue </P> </Td> <Td> <Ul> <Li> Arthralgia </Li> <Li> Myalgia </Li> <Li> Back pain </Li> </Ul> </Td> <Td> </Td> <Td> </Td> <Td> <Ul> <Li> Arthritis </Li> <Li> Calcinosis (calcification of ligaments </Li> </Ul> <P> and tendons) </P> <Ul> <Li> Premature epiphyseal fusion </Li> <Li> Exostosis </Li> <Li> Hyperostosis </Li> <Li> Osteopenia </Li> <Li> Tendonitis </Li> </Ul> </Td> </Tr>

Which of the following is an oral retinoid used in the treatment of acne