<prompt> Which of the following is true about the WHO analgesic ladder for chronic pain in adults?Analgesics are given on demandMorphine used for severe painAdjuvants are indicated only for mild painNon opioid analgesic are given for moderate pain.  <response>: The 3 main principles: By the clock: Drugs should be given around the clock rather than on demand. By the mouth: Oral route is preferred. By the ladder: Non-opioids - Mild opioids - Strong opioids. Non opioid analgesic are given for mild pain. Adjuvants can be used for mild, moderate and severe pain 