Knockout drops are -: (A) Paraldehyde, (B) Chloral hydrate, (C) Kerosene, (D) Turpentine
Answer is B. Ans. is 'b' i.e., Choral hydrate o The action of choral hydrate is so rapid that is has been given the name of'Knockout drops',o Mickey Finn: combination of choral hydrate and alcohol.