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: Biochemistry
Tyrosine deficiency causes ? 
Select and explain. 
A. Depression, B. Hypehyroidism, C. Hyperpigmentation, D. Phenylketonuria
A: Depression
Answer: A: Depression 
Explanation: Ans. is 'a' i.e., Depression Tyrosine deficiency causes hypothyroidism (lethargy, weight gain) as tyrosine is required for T3 & T4; depression (due to dopamine deficiency); albinism & hair hypopigmentation (due to deficiency of melanin); and stunted growth (as tyrosine is a component of proteins).