This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Blood, Subject name: Pathology
Anemia is characterized by 
Select and explain. 
A. Mucous membranes are pallor, B. Heart rate increased, C. Mid- systolic flow murmur, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: D. i.e. (All of the above) (365- Harsh Mohan 5th)General sign and symptoms of Anemia1. Pallor - is most common sign - conjunctivae and skin2. CVS - Tachycardia, collapsing pulse, cardiomegaly, midsystolic flow murmur, dyspnoea on exertion, CHF3. Ocular manifestation - Retinal haemorrhage4. CNS - Attack of faintness, giddiness, headache, tinnitus, drowsiness, numbness and tingling sensations of the hands and feet.5. Reproductive system - Amenorrhoea and menorrhagia6. Renal system - Mild proteinuria and impaired concentrating capacity of the kidney7. GIT - Anorexia, flatulence, nausea, constipation and weight loss.