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# The substances which affect the central nervous system and induce sleep are called

$(a)\;antipyretics\qquad(b)\;tranquilizers\qquad(c)\;analgesis\qquad(d)\;None\;of\;the\;above$

Explanation :
The drugs given to the patients suffering from anxiety and mental tension are called tranquillizers . They affect the central nervous system and induce sleep .