A kind of trigger that is an effect which reminds a person of their habits and increases their desire for a substance is called: 
D. External trigger
People, activities, places, and objects that elicit thoughts or cravings associated with substance use are examples of the external trigger. 
        
             
        
        
        
Answer:
Community medical centers are usually smaller versions of hospitals.
Community medical centers employ family doctors, nurses, and technicians, but usually not many medical specialists.
 
        
             
        
        
        
This kind of exposure is called caustic exposure.
Explanation:
A caustic exposure is an exposure to chemicals present in common household cleaning products like detergents, cleaning solutions, drain cleaners etc. 
These contain caustic substances (strong concentration of acid or base) like sodium hydroxide, sulfuric acid etc. When exposed directly on to the skin, due to its stronger concentration, it may burn the skin causing redness, irritation, numbness, or blackening of the skin surface. 
Most of the times, these marks go away after some weeks because they are superficial or first-degree burn where only the epidermal layer of the skin gets affected.
 
        
                    
             
        
        
        
Answer:
Lidocaine is the anesthetic drug that are used for the numb tissue of the specific area. Nerve can be blocked by using this drug. The drug can affect the humans, dogs as well as other animals.
Lidocaine can cause toxicity in dogs. The most common effect of this drug in dogs is the muscle tremors. This drug decrease the systolic blood pressure of dogs. Respiratory distress may also occur in dogs due to high toxicity level of the drug. The drug also effects the central nervous system and gastro intestinal tract of dog.