This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
Skin hazards of swimming are – a) Verrucaeb) Pyoderma gangrenosumc) M. marinum gangrenosumd) M. ulcerans infection 
Select and explain. 
A. a, B. bc, C. ad, D. ac
D: ac
Answer: D: ac 
Explanation: Important skin problems caused by swimming pool are : Pseudomomonas dermatitis, chlorine irritation, M. marinum swimming pool granuloma, molluscum contagiosum, Plantar warts (verrucae), swimming pool conjuctivitis (adenovirus), swimmer's itch (schistosoma).