Explanation:

 Legal cultivation of opium for medicinal purposes is carried out in India, only in selected areas, under free licensing conditions. India is the world's largest manufacturer of legal opium for the pharmaceutical industry according to the CIA World Factbook. Legal cultivation for medical use is permissible within the ambit of United Nations, Single Convention on Narcotic Drugs 1961.The crop year starts from 1 September and ends on 30 October each year. Some place where opium is grown are Pratapgarh in Rajasthan; Mandsaur, Ratlam, Neemuch in Madhya Pradesh; and Barabanki, Bareilly, Lucknow & Faizabad in Uttar Pradesh.