<prompt> A 35 years old male, with pre-morbid anxious traits heavy smoker, believes that he has been suffering from lung carcinoma for a year, No significant clinical finding is detected on examination and relevant investigation. He continues to stick to his belief despite evidence to the contrary. In the process, he has spent a huge amount of money, time and energy in getting himself unduly investigated. He is most likely suffering from -Carcinoma lungHypochondriacal disorderDelusional disorderMalingering  <response>: Preoccupation with fear of serious illness lung cancer, normal clinical examination investigation and multiple investigations suggest the diagnosis of hypochondriasis. 