<unk>  (Latin for "whey") may refer to:
Blood plasma, with clotting factors removed
Serous fluid, any clear bodily fluid
Truth<unk> , a general term for sedative drug or unspecified drug that is likely to make people tell truth or divulge information
Medication, derived from an animal's blood or serous fluid, often involving:
Antibody, protein used by the immune system to identify and neutralize foreign objects like bacteria and viruses
Antivenom, biological product used in the treatment of venomous bites or stings
Antiviral drug, used specifically for treating viral infections
Antidote, substance which can counteract a form of poisoning
Antibody, protein used by the immune system to identify and neutralize foreign objects like bacteria and viruses
Antivenom, biological product used in the treatment of venomous bites or stings
Antiviral drug, used specifically for treating viral infections
Antidote, substance which can counteract a form of poisoning
Serum
Blood
Urine
Tissue 
Cerebrospinal fluid
Chest
Exudate
Head 