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
[{'content': 'A  60-year-old  woman  complained  of  weakness,  lethargy  and  easy  fatigability.  Investigation showed that she had iron deficiency anaemia (Hb. 8 g/dl). She was prescribed cap. ferrous fumarate 300 mg twice daily. She returned after one month with no improvement in symptoms. Her Hb. level  was  unchanged.  On  enquiry  she  revealed  that  she  felt  epigastric  distress  after  taking  the iron  capsules,  and  had  started  taking  antacid  tablets  along  with  the  capsules. What could be the possible reason for her failure to respond to the oral iron medication? \nSelect and explain. \nA. Lower pH is required for absorption of oral iron salts, B. Higher pH is required for absorption of oral iron salt, C. Oral iron can not cross biomembranes in any form, D. Any of the above can be possible reason.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Gastric acid is required for the absorption of oral iron salts. Concurrent ingestion of antacid\xa0tablets\xa0could\xa0 have interfered with\xa0iron\xa0 absorption.\xa0 Hence,\xa0 the\xa0 anaemia\xa0 failed\xa0 to\xa0 improve.', 'role': 'assistant'}]