This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
Intolerance to a drug occurs at what dose in an individual ? 
Select and explain. 
A. Subtherapeutic dose, B. Therapeutic dose, C. Toxic dose, D. Not related to the dose of drug
B: Therapeutic dose
Answer: B: Therapeutic dose 
Explanation: Ans. is'b'i.e., Therapeutic dose IntoleranceIt is the appearance of characteristic toxic effects of drug in an individual at therapeutic doses.Converse of tolerance and indicates a low threshold of the individual to the action of a drug.